Easy Plum Crumble with Oats
Juicy baked plums under a golden, buttery oat topping. Just 4 ingredients, no mixing bowl, and a warm fall dessert on the table in about 30 minutes.
Born from a desire to embrace seasonal abundance and eliminate waste, this easy plum crumble with oats is the ultimate rescue for counter-ripened plums. Every year, as summer transitions into fall, the plums ripen all at once, and suddenly there is more fruit than anyone can eat. I used to honor them by baking elaborate, oversized crumbles, but that always left me with the same thought: a giant pan of lonely leftovers, a sink overflowing with bowls.
Sometimes, less is truly more. By letting go of the extra ingredients and skipping the mixing altogether, I stumbled upon perfection: this effortless plum crumble. All it takes is layering everything into a small dish and stepping away. As it bakes, your kitchen transforms with the scent of toasted butter and warm fruit. The plums turn beautifully soft, jammy, and bubbly, tucked beneath a deeply crisp, golden oat topping. Simplicity at its finest.
It is a great treat for breakfast or any time of the day, because it is light enough to enjoy with a spoonful of yogurt in the morning and just as lovely next to a cup of coffee or tea in the afternoon. Think of it as the easiest coffee cake or tea cake alternative you will bake this fall.
This was inspired by my Easy Baked Stuffed Apples with Oats, Nuts & Maple Syrup on my blog.
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Why you will love this recipe
This easy plum crumble is a dream for anyone searching for an easy plum dessert or mastering healthy flourless baking ideas with rolled oats. Designed as a simple 4 ingredient dessert, this fall plum dessert with 4 ingredients is the ultimate choice for a plum crumble for two or a small batch plum crumble. Featuring a golden, crisp topping, this plum crumble with oats functions as a guilt free low calorie dessert and an excellent healthy plum crumble option that kids will love. It is an incredibly versatile plum crisp that works beautifully as a plum crumble for breakfast or a plum crumble for breakfast with Greek yogurt, making healthy naturally sweetened fruit bakes for kids entirely effortless.
- Only 4 ingredients. Plums, sugar, oat flour and butter.
- No mixing. You sprinkle the layers and bake. That really is it.
- Small batch. It serves 2 to 3, so it is perfect for a cozy night in, with no mountain of leftovers.
- Naturally gluten-free when you use certified gluten-free oat flour.
- Light enough for breakfast. Warm plum crumble with Greek yogurt is a seriously good morning.
- A perfect coffee cake or tea cake style treat. Serve a small portion with your afternoon coffee, and preferred tea.
- A cozy fall dessert. Plums are at their best from late summer into early fall and a warm crumble suits that crisp-weather baking mood.
- You control the sweetness. Use less sugar, more sugar, or swap it for your favorite sweetener and taste as you go.
- Ready in 30 minutes with only 5 minutes of hands-on prep.
What you will need
- Fresh plums: ripe but slightly firm plums give the best balance of sweet and tart. Halved and pitted, no peeling needed. Frozen plums work too.
- Granulated sugar: a little sprinkled over the fruit and a little in the topping. You can adjust the amount to your taste.
- Oat flour: the base of the crumble topping. Use certified gluten-free oat flour if you need it gluten-free. You can create oat flour by simply blending rolled oats in a coffee grinder or high-speed blender for 30 to 60 seconds until they turn into a fine, powdery flour..
- Cold butter: cut into small cubes straight from the fridge, so it melts slowly into a crisp, golden topping.
See recipe card for quantities.
Instructions how to prepare it
Prepare the plums. Preheat your oven to 400°F (200°C). Halve the plums, remove the pits, and place them cut side up in a small baking dish. Sprinkle with the first tablespoon of sugar.
Using frozen plums? Take them out of the freezer about 15 minutes before baking. Do not let them thaw completely, or they will release too much juice before they even reach the oven.
Add the sugar. Sprinkle the remaining sugar over the plums.
Add the oat flour in doses, a tablespoon at a time, and check as you go. Depending on the type of flour you use, you may need a little more or a little less to cover the plums with a light, even layer.
Finish by scattering the cold butter cubes over the top. Resist the urge to stir. The butter melts into the oat flour as it bakes, and that is what creates the crumble.
Bake. Bake for 25 to 30 minutes, until the butter has melted, the topping is golden brown, and the plums are soft and bubbling around the edges.
Rest, mix, then serve. Let the crumble sit for 5 to 10 minutes, then stir it gently with a spoon. As it cools, a beautiful transformation happens: the warm fruit juices thicken into a glossy, jammy sauce and the oat topping crisps up to perfection. Serve it warm or cold.
Expert tips
Match your baking dish to the batch
Use a small 6-inch (15 cm) round dish or a 5x7-inch (13x18 cm) dish, about 2 inches (5 cm) deep, so the plums fit snugly in a single layer. In a dish that is too big, the plums spread out and dry up. A snug fit keeps them juicy and bubbling under the topping.
More tips to consider:
- Keep the butter cold. Cut it straight from the fridge. Cold cubes melt slowly, which gives a crisp topping instead of a greasy one.
- Do not stir the layers. Plums, sugar, oat flour, butter. It looks too simple, but it works.
- Add the flour in doses. Different oat flours absorb differently. Add a tablespoon at a time and check that the plums are lightly covered, adding more or less as needed.
- Choose ripe but slightly firm plums. They hold their shape and give a nice sweet and tart balance.
- Keep frozen plums partly frozen. It is the best way to avoid a watery crumble.
- Adjust the sweetness to your taste. Very ripe plums need less sugar. Tart plums may want a little more.
- Watch the last few minutes. Oat flour browns fast once the butter melts, so stay close to the oven near the end.
- Check the label for gluten-free. Oats are naturally gluten-free but are often processed alongside wheat, so look for certified gluten-free oat flour.
Recipe substitutions
This highly adaptable plum crumble recipe functions as an easy 4 ingredient plum crumble with oat flour masterpiece, creating a completely gluten-free dessert and gluten-free plum crumble. It stands out among the best gluten free fruit crumble recipes, offering a celiac safe oat crust crumbles base that makes it a premier choice for allergen friendly warm fruit desserts for hosting.
- Vegetarian: the recipe is vegetarian as written.
- Gluten-free: use certified gluten-free oat flour.
- Dairy-free: swap the butter for plant-based butter or solid coconut oil, in the same amount.
- Vegan: use plant-based butter or coconut oil, and make sure your sugar is vegan-friendly (some white sugar is processed with bone char), or use coconut sugar or maple syrup.
- Gluten-free and dairy-free: certified gluten-free oat flour plus plant-based butter. It works beautifully.
- Sugar: granulated sugar can be swapped for coconut sugar, brown sugar, maple syrup, honey or a baking-friendly sweetener.
- Similar products: swap oat flour for almond flour, or use a mix of oat flour and finely ground rolled oats for a heartier, more rustic topping. Add the flour in doses and check, since you may need more or less.
- Fruit: nectarines, peaches, apricots, pears, apples or berries can replace the plums.
Recipe variations
- Cinnamon plum crumble: add a pinch of cinnamon to the topping for a warm, spiced, fall flavor.
- Vanilla and almond: a few drops of vanilla or almond extract over the plums.
- Plum crisp with oats: swap part of the oat flour for rolled oats and add a spoonful of chopped nuts for extra crunch.
- Plum and berry crumble: replace a handful of plums with blueberries or raspberries.
- Maple plum crumble: use maple syrup instead of sugar for a cozy, Thanksgiving-style twist.
- Ginger plum crumble: add a little fresh grated ginger or ground ginger.
- Peach, apricot or apple crumble: use the same method with other fruit. Baking time may vary a little.
- Crowd-friendly version: double everything and bake in an 8x8-inch (20x20 cm) dish for 4 to 6 servings, adding a few minutes to the bake.
- Cultural twists: add a pinch of cardamom for a Scandinavian feel, a splash of orange blossom water for a Middle Eastern note, or a little lemon zest for a European-style crumble.
How to Serve
Perfect as an easy plum dessert to serve with coffee or an easy plum dessert to serve with tea, this low sugar plum crumble delivers a rustic, bakery-style finish in a fraction of the time. Whether you need a small batch gluten-free plum crumble for two for a cozy night in or a fast, macro-friendly treat, this warm fruit bake is the perfect solution.
- Warm, straight from the dish, or cold. This plum crumble is a great treat for breakfast or any time of the day.
- For breakfast: a big spoonful of Greek yogurt on top.
- As a coffee cake or tea cake: a small serving next to a hot cup of coffee, black tea, chai or Earl Grey.
- As dessert: a scoop of vanilla ice cream.
- Extra cozy: a little whipped cream, a pinch of cinnamon, or a drizzle of honey.
What Equipment to Use
- A small baking dish: a 6-inch (15 cm) round dish or a 5x7-inch (13x18 cm) oval or rectangular dish, about 2 inches (5 cm) deep.
- A small knife and cutting board.
- Measuring spoons.
- An oven preheated to 400°F (200°C).
- Optional: a blender or food processor if you want to make your own oat flour from gluten-free rolled oats.
How to Store Leftovers
Cover and refrigerate for up to 2 days. To warm up, reheat in the oven at 350°F (175°C) for about 10 minutes, or in the microwave until warm. The oven brings back the crisp topping best.
Frequently Asked Questions (FAQ)
Yes. Very ripe plums are naturally sweet, so you can cut the sugar way down or replace it with your favorite sweetener. Dose it to your taste.
Both are baked fruit desserts with a crunchy topping. A crisp usually includes rolled oats, while a crumble is often made with flour, butter and sugar. This recipe sits happily between the two.
Yes. Use an 8x8-inch (20x20 cm) dish and add a few minutes to the baking time.
Definitely. Peaches, nectarines, apricots, apples, pears and berries all work. Baking time may vary a little.
Yes. Blend gluten-free rolled oats in a blender or food processor until they turn into a fine powder.
A 6-inch (15 cm) round dish or a 5x7-inch (13x18 cm) dish, about 2 inches (5 cm) deep, is ideal for this small batch.
Yes. Take them out about 15 minutes before baking and keep them partially frozen so they do not release too much juice.
Yes. It makes a wonderful coffee cake or tea cake style treat, light enough for an afternoon cup of coffee, black tea or chai.
Absolutely. It is light and fruity, and delicious with Greek yogurt. It is also lovely as an afternoon snack or a dessert at any time of day.
Oat flour is my first choice because it gives a nutty, buttery, golden topping. Almond flour, all-purpose flour or a gluten-free 1:1 baking blend also work. Since each flour absorbs differently, add it in doses and check, using a little more or less until the plums are lightly covered.
Yes. Use certified gluten-free oat flour and swap the butter for plant-based butter or coconut oil. It also works as a vegan plum crumble if your sugar is vegan-friendly.
Yes, as long as you use certified gluten-free oat flour.
Final Thoughts
This plum crumble proves you do not need a long ingredient list or a lot of time to make something cozy and delicious. It is the kind of recipe you come back to again and again, especially when you want something sweet that feels homemade without the extra work. Make it for breakfast, serve it with your afternoon coffee or tea, or bring it out warm after dinner.
If you try it, leave a comment and a star rating below and tell me how you sweetened yours and how you served it. Pin this recipe so you can find it again.
Enjoy easy cooking!
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Recipe
Easy Plum Crumble with Oats
Ingredients
- 10.6 oz pitted plums, halved 300 g
- 1 tablespoon granulated sugar 12-13 g, for the plums
- 4 tablespoons oat flour about 32 g, added in doses; you may need a little more or less depending on the flour
- 2 tablespoons granulated sugar about 25 g, for the topping, adjusted to your taste
- 2 tablespoons cold butter 30 g / 1 oz, cut into small cubes
Instructions
- Prepare the plums. Preheat your oven to 400°F (200°C). Halve the plums, remove the pits, and place them cut side up in a small baking dish. Sprinkle with the first tablespoon of sugar. Using frozen plums? Take them out of the freezer about 15 minutes before baking. Do not let them thaw completely, or they will release too much juice before they even reach the oven.
- Add the sugar. Sprinkle the remaining sugar over the plums.
- Add the oat flour in doses, a tablespoon at a time, and check as you go. Depending on the type of flour you use, you may need a little more or a little less to cover the plums with a light, even layer.
- Finish by scattering the cold butter cubes over the top. Resist the urge to stir. The butter melts into the oat flour as it bakes, and that is what creates the crumble.
- Bake. Bake for 25 to 30 minutes, until the butter has melted, the topping is golden brown, and the plums are soft and bubbling around the edges.
- Rest, mix, then serve. Let the crumble sit for 5 to 10 minutes, then stir it gently with a spoon. As it cools, a beautiful transformation happens: the warm fruit juices thicken into a glossy, jammy sauce and the oat topping crisps up to perfection. Serve it warm or cold.
Video
Notes
- A small baking dish: a 6-inch (15 cm) round dish or a 5x7-inch (13x18 cm) oval or rectangular dish, about 2 inches (5 cm) deep.
- A small knife and cutting board.
- Measuring spoons.
- An oven preheated to 400°F (200°C).
- Optional: a blender or food processor if you want to make your own oat flour from gluten-free rolled oats.
- Keep the butter cold. Cut it straight from the fridge. Cold cubes melt slowly, which gives a crisp topping instead of a greasy one.
- Do not stir the layers. Plums, sugar, oat flour, butter. It looks too simple, but it works.
- Add the flour in doses. Different oat flours absorb differently. Add a tablespoon at a time and check that the plums are lightly covered, adding more or less as needed.
- Choose ripe but slightly firm plums. They hold their shape and give a nice sweet and tart balance.
- Keep frozen plums partly frozen. It is the best way to avoid a watery crumble.
- Adjust the sweetness to your taste. Very ripe plums need less sugar. Tart plums may want a little more.
- Watch the last few minutes. Oat flour browns fast once the butter melts, so stay close to the oven near the end.
- Check the label for gluten-free. Oats are naturally gluten-free but are often processed alongside wheat, so look for certified gluten-free oat flour.
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