Healthy Apple Blueberry Crisp with Oats
Juicy apples and blueberries under the crisp oat-walnut topping I come back to when I want an easy, fruit-based dessert. This apple blueberry crisp combines tender apple chunks and juicy blueberries with a golden oat and walnut topping. The fruit stays soft but not watery, while the topping has plenty of crunch from rolled oats, walnuts and little pockets of butter.
My version is a little more whole-food focused than a traditional crisp: I use maple sugar for sweetness, arrowroot to thicken the fruit naturally, and oats and walnuts for more texture and fiber. I’ve also made it with my homemade gluten-free flour mix and simple dairy-free swaps, without changing what makes a good crisp so satisfying.
Why This Apple Blueberry Crisp Works
There are only two parts to get right: juicy fruit and a topping that actually stays crisp.
- Apples + blueberries balance each other. Apples give the filling structure while blueberries soften and release juice as they bake.
- Rolled oats and walnuts create the crunch that makes this technically a crisp rather than a traditional flour-based crumble. I used my universal oat crumble topping recipe here.
- Arrowroot controls the extra moisture without making the fruit filling heavy.
- Cold butter creates irregular clusters instead of a flat, sandy topping.
- Maple sugar adds a mild caramel flavor without overwhelming the fruit.
- Fresh or frozen blueberries work, so this isn’t limited to blueberry season.
The result is an apple crisp with blueberries that tastes fruity rather than overly sweet, with a topping that’s crisp around the edges and a little softer where it meets the warm fruit.
Why I Use These Ingredients
- Apples + blueberries: Use firm apples that hold some shape while baking. Gala works well for a sweeter crisp, or combine a sweet apple with a tart variety for more contrast.
- Blueberries bring both sweetness and acidity and create the juicier part of the filling. Fresh and frozen both work. Best swap: Blackberries or raspberries can replace the blueberries. For a darker, slightly more tart apple-and-berry variation try this Blackberry And Apple Crisp.
- Rolled oats + walnuts: oats give the topping its characteristic crisp texture, while walnuts add another layer of crunch and a slightly rich, toasted flavor. Use old-fashioned rolled oats, not steel-cut oats. Quick oats can work, but the topping will be finer and less textured. For a nut-free crisp, omit the walnuts or replace them with pumpkin or sunflower seeds.
- Flour: a small amount of flour helps the butter form clusters around the oats instead of simply melting through them. For a gluten-free apple blueberry crisp, use the same amount of a reliable 1:1 gluten-free flour blend and certified gluten-free oats. This gives the closest result to the original rather than trying to substitute several different flours at once.
- Arrowroot: apples and especially blueberries release liquid as they bake. Arrowroot thickens those juices so you still get a saucy fruit filling without a pool of liquid at the bottom.
- Maple sugar: I like maple sugar here because its mild caramel flavor works naturally with apples, cinnamon and walnuts. Coconut sugar or brown sugar can be substituted in the same role. If your apples are especially sweet, you can also reduce the sugar in the fruit layer slightly.
- Butter, cinnamon + nutmeg: cold butter is important for the texture of the topping. Cinnamon and nutmeg simply bring out the flavor of the apples and toasted oats. For dairy-free, a firm plant-based butter is the closest substitute because it behaves more like regular butter when cold.
See all measurements in the recipe card:
How to Make Apple Blueberry Crisp
1. Prepare The Fruit
- Preheat the oven to 360°F (182°C).
- Core the apples and cut them into fairly even chunks. Add them to a 9-inch square baking dish with the blueberries.
- Add the maple sugar, arrowroot, lemon juice and cinnamon and toss until the fruit is evenly coated. Spread into an even layer.
2. Make the oat-walnut topping
- For the easiest chunky topping, chill or freeze the butter until very cold.
- Pulse the cold butter and flour briefly in a food processor until coarse crumbs form. You want irregular pieces rather than a completely fine mixture.
- Add the rolled oats, walnuts, maple sugar, cinnamon and nutmeg. Stir just until everything is evenly distributed.
No food processor? Cut the cold butter into the flour with a pastry cutter, fork or your fingertips, then mix in the remaining ingredients.
3. Assemble
- Scatter the oat-walnut mixture evenly over the apples and blueberries.
- Don’t press the topping firmly into the fruit. Leaving it loose helps more of the surface become crisp. Just tap a few times to set.
4. Bake
- Bake for about 35 minutes, until the topping is golden and the fruit juices are bubbling around the edges.
- If you’re using frozen blueberries, the crisp may need a few extra minutes.
5. Let it rest
Allow the crisp to cool for about 15–20 minutes before serving. The fruit juices continue to thicken as it rests.
Serve warm, at room temperature or chilled. It’s also good with vanilla or homemade dairy-free ice cream if you want to turn it into a more traditional dessert.
Tips for the Best Result
➊ If using frozen blueberries: Add them directly from the freezer, don’t thaw first. Thawed berries release their juice before baking and can make the filling much wetter. Expect the crisp to need another 5–10 minutes in the oven.
➋ If making it gluten-free: Use ⅓ cup 1:1 gluten-free flour blend in place of the flour and make sure the oats are certified gluten-free. Different single flours absorb butter very differently, so a blend is the easiest way to preserve the original topping texture.
➌ If making it dairy-free: Replace the 6 tablespoons of butter with the same amount of a firm dairy-free butter. Chill it well before using. Solid coconut oil can also work, but the topping tends to be more uniform and less buttery/crumbly.
➍ If changing the baking dish: The recipe is designed for approximately a 9-inch square dish. An 8-inch square dish gives you a deeper fruit layer and may need a little longer to bake. A much larger dish spreads the fruit and topping too thin unless you increase the recipe.
➎ If the topping is browning before the fruit bubbles: Loosely cover the top with foil and continue baking until you see bubbling fruit around the edges. That’s a better indicator of doneness than color alone.
➏ If your fruit is especially juicy: Don’t skip the arrowroot. This matters most with very ripe apples or frozen blueberries.
➐ For more pronounced crisp clusters: Don’t over-process the butter and flour. Some larger crumbs are exactly what you want. If it looks too sandy, use your hand to squeeze the mixture a bit to create clusters.
Apple Blueberry Crisp FAQs
With an oat-based topping, this recipe is technically closer to an apple blueberry crisp, especially in American terminology. Crumble and crisp are sometimes used interchangeably, which is why you may also see recipes called apple blueberry crumble with oats. The important difference here is the rolled oats and walnuts, which give the topping its crisp texture.
Very well. Apples stay relatively firm and provide structure, while blueberries soften and release juice. Their flavors also balance nicely: sweet apples soften the berries’ tartness, while blueberries keep an apple dessert from tasting overly sweet or one-dimensional.
Yes. Frozen blueberries work very well in this recipe and don’t need to be thawed. Add them straight from the freezer and allow a few extra minutes of baking time if needed.
Firm baking apples work best. Gala gives a sweeter, softer result, while Granny Smith adds tartness and holds its shape particularly well. Honeycrisp, Pink Lady and Braeburn are also good choices. For the most balanced filling, use a mixture of sweet and tart apples.
Usually there is either too much fruit liquid or the thickener hasn’t had enough time to work.
Use the full amount of arrowroot, don’t thaw frozen blueberries, bake until the filling is visibly bubbling, and let the crisp rest for 15–20 minutes before serving. The sauce thickens as it cools.
Yes. Prepare the fruit filling and topping separately and refrigerate them for up to 2 days. Add the topping just before baking so it doesn’t absorb moisture from the fruit.
Leftover baked crisp keeps for about 3 days in the refrigerator.
It can also be frozen, baked or unbaked, for up to 3 months. For the freshest topping, freezing it unbaked works best.
If you try this apple and blueberry crisp recipe, leave a quick ★★★★★ rating and tell me how it turned out!
Healthy Apple Blueberry Crisp Recipe
Ingredients
Apple Blueberry Filling
- 4 medium apples - cut into chunks
- 1 cup blueberries - fresh or frozen
- 2 tbsp arrowroot flour - or any other starchy flour
- 1 tbsp lemon juice - freshly quizzed
- ½ tsp cinnamon powder
- 3 tbsp maple sugar - or favorite granulated sweetener
Oat Walnut Crisp Topping
- ¾ cup rolled oats
- ⅓ cup flour - see gluten-free option below
- ½ cup crushed walnuts - or use seeds if allergic to nuts
- 6 tbsp cold butter - (see dairy-free option below)
- ⅓ cup maple sugar - or favorite granulated sugar
- ½ tsp cinnamon powder
- ¼ tsp nutmeg - or cardamom
Instructions
Chill the butter
- Place your butter in the freezer for at least 1 hour before starting.
Prepare the filling
- Preheat the oven to 360°F (182°C).
- Add the chopped apples and blueberries to a 9-inch square baking dish.
- Add the arrowroot, maple sugar, lemon juice and cinnamon and toss until evenly coated. Spread the fruit into an even layer.
Make the topping
- If you have a food processor: add the cold butter and the flour to the bowl of a food processor and pulse briefly until coarse crumbs form. No food processor? Cut the cold butter into the flour with a pastry cutter, fork or your fingertips, then mix in the remaining ingredients.
- Add the rolled oats, walnuts, maple sugar, cinnamon and nutmeg and mix by hand until combined.
Assemble
- Scatter the oat-walnut topping loosely and evenly over the fruit.
Bake
- Bake for about 35 minutes, or until the topping is golden and the fruit is bubbling around the edges. Frozen blueberries may require another 5–10 minutes.
Cool and Serve
- Let the crisp rest for 15–20 minutes before serving so the fruit juices can thicken.Serve warm, at room temperature or chilled.
Notes
Nutrition
The information shown is an estimate provided by an online nutrition calculator.
If peaches are in season, this peach crisp uses a similar oat topping.
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How would I do it if I only use blueberries not with apple Thank You
I would increase the blueberry amount to 5 cups (or 4, depends on their size) and probably 1 teaspoon more of starchy flour since they have more juice and the rest keep the same.
I cut some of the sugar amount because I used cosmic crisp apples, and it turned out just right! Definetly recommend the frozen butter in the food processor for a faster crumb!
Absolutely delicious, can’t get enough! I think I found my favorite apple and blueberry crumble recipe!
Enjoy! Thanks for your feedback!