This healthy blackberry crumble is the best easy summer dessert. It has a jammy, maple-sweetened berry filling and a crisp oat-walnut topping. It's vegan, gluten-free, and dairy-free, with no refined sugar. I've made it on repeat all summer, and it comes together in 5 minutes of prep.
Healthy Blackberry Crumble At A Glance
- ✅ Recipe Name: Healthy Blackberry Crumble with Oats (Vegan + Gluten-Free!)
- 🕒 Ready In: 40 minutes (5 min prep + 35 min bake)
- 👪 Serves: 12 in a 9x13" dish (halve it for a 9-inch pie dish)
- 🍽 Calories: ~213 per serving
- 🫐 Main Ingredients: Fresh or frozen blackberries, rolled oats, almond flour, walnuts, maple syrup, coconut oil, coconut sugar
- 📖 Dietary Info: Gluten-free, dairy-free, refined sugar-free, vegan, nut-free (when walnuts are swapped for seeds and almond flour for oat flour)
- 🫙 Make-Ahead & Storage: Assemble up to 24 hours ahead; keeps 3 days in the fridge
- ⭐ Why You'll Love It: Tastes like a classic buttery blackberry crumble but made without butter, refined flour, or white sugar, and works with fresh or frozen blackberries year-round.
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Berry crumbles and crisps are my favorite summer desserts. You all loved my healthy mixed berry crisp, healthy strawberry crumble, and this healthy peach crisp, so a blackberry version was overdue.
I tested this one all through blackberry season to get the filling right. Blackberries throw off more liquid than you'd think, so the starch and the lemon juice matter more here than in my other crisps. After a few rounds, I landed on a filling that sets up jammy rather than soupy, with a crisp oat-and-walnut topping.
It comes together in about 5 minutes with fresh or frozen blackberries, maple syrup, rolled oats, almond flour, walnuts, and a few pantry staples. It's vegan, dairy-free, gluten-free, and naturally sweetened.
I like it warm with vanilla protein ice cream or whipped cream. It's the dessert I keep making when the berries are good.
Jump to:
- Healthy Blackberry Crumble At A Glance
- Why You'll Love This Recipe
- What's the Difference Between a Crumble and a Crisp?
- Ingredients You'll Need
- Ingredient Substitutions & Variations
- How to Make A Healthy Blackberry Crisp with Oats (Step-by-Step)
- My Tips + Notes From My Kitchen
- Serving Suggestions and Toppings
- How to Store & Make Ahead
- Blackberry Crumble FAQs
- More Healthy Berry Crumble Recipes to Try
- 📖 Recipe
- 💬 Comments
Why You'll Love This Recipe
- It's lighter than a classic crumble: This version skips the butter, refined flour, and white sugar, but keeps the buttery, crisp-topped texture.
- It takes 5 minutes to prep: You toss the filling and mix the topping by hand, with no peeling or special equipment.
- It fits most diets: The recipe is vegan, gluten-free, and dairy-free, made entirely with wholesome ingredients.
- It's naturally sweetened: Maple syrup and a little coconut sugar sweeten it without any refined sugar.
- The oat walnut topping bakes up crisp: Rolled oats, almond flour, and walnuts turn golden and crunchy over the warm berries.
- It works with fresh or frozen blackberries: You can make it in peak summer or year-round whenever the craving hits.
⭐️⭐️⭐️⭐️⭐️
So good! Easy to make and the whole family loved❤️
- Katlyn P.
What's the Difference Between a Crumble and a Crisp?
A crisp has oats in the topping, and a crumble doesn't. That's the whole difference. A crisp bakes up crunchy from the oats, while a classic crumble topping is just flour, sugar, and butter, so it stays softer and more sandy.
This recipe has oats, almond flour, and walnuts on top, so it's technically a crisp. I call it a crumble because that's what people search for, and the names get used interchangeably anyway. Make it and call it whatever you like.
A cobbler is the only one that's actually different. It has a biscuit or cake topping, not a crumbly one.
Ingredients You'll Need
For The Blackberry Filling
- Blackberries: Fresh or frozen, both work. No need to thaw if frozen.
- Coconut sugar: Adds a little extra sweetness to the berries. You can swap in light brown or granulated sugar.
- Lemon juice: Brightens the filling and balances the sweetness.
- Tapioca or arrowroot starch: Thickens the juices so the filling sets up jammy instead of runny. Cornstarch works too.
For the Oat Crumble Topping
- Rolled oats: Use gluten-free certified old-fashioned oats for the best crisp texture. Skip quick or instant oats.
- Almond flour: Adds richness and helps the topping clump. It's the same flour I use in my almond flour banana muffins. Oat flour works if you need it nut-free.
- Walnuts: Bring the crunch. Swap with chopped almonds or pecans.
- Maple syrup: Sweetens the topping and helps it crisp up in the oven.
- Coconut oil: Keeps the topping crisp on the outside and tender on the inside. Melted butter works if you're not dairy-free.
- Cinnamon and salt: Cinnamon adds warmth, and salt sharpens all the flavors. Don't skip the salt.
- Vanilla extract: Rounds out the topping.
See recipe card for quantities.
Ingredient Substitutions & Variations
This crumble is easy to adapt. Here are the swaps I've tested and the ones that work.
- Make it nut-free: Swap the walnuts for pumpkin or sunflower seeds, and use oat flour in place of almond flour.
- Walnuts: Use chopped almonds or pecans instead.
- Almond flour: Oat flour works well here. Do not use coconut flour.
- Coconut oil: Melted butter works if you're not keeping it dairy-free.
- Coconut sugar: Light brown sugar or granulated sugar both work in the filling.
- Tapioca starch: Arrowroot or cornstarch thicken the filling just as well.
- Maple syrup: Honey or agave both work, though honey makes it no longer vegan.
- Lemon juice: Orange juice works for a slightly sweeter note.
- Use a different berry: Blueberries, or a mix of berries, work in place of blackberries. My healthy blueberry crisp is the same idea.
- Make a smaller batch: Halve everything and bake in a 9-inch pie dish or skillet, like the one in my photos. Same temperature, same time, check a few minutes early.
How to Make A Healthy Blackberry Crisp with Oats (Step-by-Step)
- Step 1: Prep the crumble. Combine rolled oats, almond flour, walnuts, cinnamon, and salt in a bowl.
- Step 2: Combine. Pour in maple syrup and melted coconut oil, then mix with your hands.
- Step 3: Assemble. Toss blackberries, coconut sugar, lemon juice, vanilla, and tapioca starch in a bowl. Spoon into a greased baking dish and spread the oat mixture over the blackberries.
- Step 4: Bake. Bake at 350°F for 35 to 45 minutes, until golden and bubbly. Let cool for 10 to 15 minutes before serving.
My Tips + Notes From My Kitchen
- Mix the topping with your hands. A spoon won't coat the oats evenly. Using your fingers gets maple syrup and coconut oil into everything, which is what makes it clump and crisp rather than dry out.
- Don't skip the coconut oil. It's what crisps the topping. I've tried cutting it back, and the oats just go dry.
- Watch the liquid with frozen berries. Frozen blackberries release more juice, so don't thaw them first and don't skip the starch, or the filling runs.
- Go light on the maple syrup if your berries are sweet. One reader used a quarter cup and said she'll drop to an eighth next time. Taste your berries and adjust.
- Wait the full 10 to 15 minutes before serving. The filling sets as it cools. Cut in too early, and it'll be soupy.
Serving Suggestions and Toppings
This blackberry crumble is best served warm, about 10 to 15 minutes out of the oven. Here's how I like to top it:
- Vanilla ice cream: The classic. The cold against the warm berries is hard to beat. I love this cottage cheese protein ice cream.
- Whipped cream: Lighter than ice cream, and it melts into the topping.
- Greek yogurt: My go-to when I have leftovers for breakfast. Adds protein and a little tang.
- Chopped nuts or coconut flakes: For extra crunch on top.
How to Store & Make Ahead
- Make ahead: Assemble the crumble up to a day in advance, but don't bake it. Cover it with foil, keep it in the fridge, and bake as directed when you're ready to serve.
- Storing: This crumble is best within 3 to 5 hours of baking, while the topping is still crisp. Store leftovers in the fridge for up to 3 days, either in a sealed container or in the baking dish covered with foil.
- Reheating: For the crispest topping, reheat in a 350°F oven or toaster oven for about 10 minutes. If you're short on time, the microwave works in 15-second intervals, but the topping will soften.
Blackberry Crumble FAQs
Yes. Use them straight from frozen, without thawing. Frozen berries release more liquid, so keep the tapioca starch in to thicken the filling.
Yes, as long as you use certified gluten-free oats. The rest of the recipe uses almond flour instead of wheat flour, so there's no other gluten to worry about.
Absolutely! Prepare the recipe as directed (but don't bake), cover with foil, and store in the fridge. Bake as directed when you're ready to serve.
A runny filling usually means it needs more time to set or more starch. Let it cool for the full 10 to 15 minutes, and don't skip the tapioca starch, especially with frozen berries.
Yes. Blueberries, raspberries, strawberries, or a mix all work in place of blackberries with no other changes. Also, check out my apple and blueberry crumble.
More Healthy Berry Crumble Recipes to Try
If you loved this healthy blackberry crumble, here are a few more of my favorite recipes I make on repeat:
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📖 Recipe
Healthy Blackberry Crumble
Ingredients
The Filling:
- 7 - 8 cups fresh blackberries, (4 - 5 pints)
- 2 tablespoon coconut sugar
- 2 tablespoon fresh lemon juice
- 1 tablespoon arrowroot or tapioca starch
The Crumble Topping:
- 1 cup rolled oats, gluten-free certified
- ⅔ cup almond flour, spooned and leveled
- ⅔ cup walnuts, chopped
- ½ teaspoon salt
- ¼ - ½ teaspoon ground cinnamon, based on your preference
- ½ cup pure maple syrup
- ¼ cup melted coconut oil
- 1 teaspoon pure vanilla extract
Instructions
- Preheat the oven. Heat to 350°F and lightly grease a 9x13-inch baking dish. Set aside. Look at notes below if you want to bake in a 9-inch pie dish or 8x8 pan.
- Make the filling. In a large mixing bowl, toss the blackberries with the coconut sugar, lemon juice, and tapioca starch. Spoon the blackberries into the greased dish.
- Make the topping. In a separate bowl, mix the rolled oats, almond flour, walnuts, cinnamon, and salt until well combined. Pour the maple syrup, vanilla, and melted coconut oil over the top and mix with your hands until coated.
- Assemble. Spread the oat mixture evenly over the blackberries.
- Bake. Bake for 35 to 45 minutes, until the topping is golden and the berries are bubbling at the edges. I baked mine for about 45 minutes.
- Cool. Let cool for 10 to 15 minutes before serving.
Notes
Nutrition
Recipe tested and developed by Tati Chermayeff, creator of Healthful Blondie. A former Division I rower and Ironman triathlete, Tati develops wholesome takes on classic comfort foods, all tested in her own kitchen. She made this blackberry crumble on repeat through berry season to get the filling set just right.
Hadley says
Absolutely delicious!
Tati Chermayeff says
Music to my ears. Thank you for taking the time to leave a review!
Darcy says
Excellent recipe! I made it for my birthday. I used 1/4 c maple syrup and will use only 1/8 next time. It’s plenty sweet.
Recipes instructions don’t have cinnamon or vanilla. But I added where I thought they should be based on where they were listed in the ingredient list.
Tati Chermayeff says
So happy to hear that, Darcy! Thanks for leaving a review 🙂
Katlyn Prater says
So good! Easy to make and the whole family loved❤️
Tati Chermayeff says
Hi Katlyn, thank you SO much for leaving this 5 star review. I love this recipe too 🙂 so easy, so summer-y, so yum!