Mixed Berry Oat Crumble

This raspberry-blackberry oat crumble is the kind of cozy, fruit-filled dessert that makes your whole kitchen smell AMAZING. Juicy berries bubble under a golden oat topping that’s lightly crisp and just sweet enough, thanks to pure maple syrup instead of refined sugar.

It’s naturally gluten-free, vegan, and gets a gentle protein boost from almond flour and hemp hearts.

What if I told you this beauty takes JUST 15 minutes of hands-on prep? Pretty tempting, right?! The crumble is sandy and crisp, the fruit turns jammy and tangy-sweet, and serving it warm with extra fresh berries on top makes it look like it came straight from a bakery display.

Helpful Tips & Variations

• Pulse some oats. For that fine, sandy crumble topping, pulse part of the oats in a food processor before mixing.
• Don’t skip the rest time. Letting the crumble cool for 15 minutes after baking helps the juices thicken so it scoops neatly.
• Frozen berries work. No need to thaw, just add 5–10 minutes to the baking time until the center is bubbling.
• Make it nut-free. Swap almond flour for sunflower seed flour and omit chopped almonds for an allergy-friendly version.
• Extra crunch. Add 2 tablespoons of chopped pecans or walnuts to the topping mixture.
• Boost the protein. Stir 2 tablespoons of hemp hearts into the topping for a gentle protein bump without changing the look.
• Switch up the fruit. Blueberries, cherries, or chopped peaches all work beautifully, just keep the total fruit amount the same.
• Serve it your way. Pair with coconut yogurt for a vegan finish or a scoop of vanilla ice cream for a more indulgent touch.

Ingredients

For the fruit layer

• 4 cups raspberries (fresh or frozen, unthawed if frozen)
• 3 cups blackberries (fresh or frozen, unthawed if frozen)
• 3 tbsp pure maple syrup (add 1–2 tbsp more if berries are very tart)
• 2 tbsp lemon juice
• 2 tsp vanilla extract
• 3 tbsp arrowroot starch (or cornstarch)
• Pinch fine sea salt

For the crumble topping

• 1 1/4 cups rolled oats, certified gluten-free
• 1/2 cup almond flour (extra-fine)
• 1/4 cup hemp hearts (shelled hemp seeds)
• 1/4 cup finely chopped almonds or almond meal
• 1/3 cup pure maple syrup
• 1/3 cup melted coconut oil or light olive oil
• 1 tsp ground cinnamon
• 1/4 tsp fine sea salt
• 1 tsp vanilla extract

For garnish

• Extra fresh raspberries and blackberries

How to Make Mixed Berry Oat Crumble

1. Preheat the oven. Set your oven to 350°F / 175°C. Lightly grease a 2- to 2.5-quart baking dish. Place a sheet pan on the lower rack to catch any juicy drips (saves on oven scrubbing, TRUST me).

2. Mix the fruit layer. In a large bowl, whisk together the maple syrup, lemon juice, vanilla, arrowroot starch, and a pinch of salt until smooth, no lumps. Add the raspberries and blackberries, and gently toss until coated. Pour the mixture into your baking dish, spreading it evenly.

3. Prepare the crumble topping. In a food processor, pulse about 3/4 cup of the oats into a coarse flour (this creates that fine and sandy top). In a separate bowl, combine the pulsed oats, remaining whole oats, almond flour, hemp hearts, chopped almonds, cinnamon, and salt. Stir in the maple syrup, melted coconut oil, and vanilla until everything is evenly moistened and clumps form when pressed between your fingers.

4. Add the topping. Sprinkle the crumble evenly over the fruit, covering edge to edge. Lightly pat it down with your fingertips, just enough so it settles without packing it too tightly.

5. Bake. Bake for 35–40 minutes, until the topping is golden brown and the fruit is bubbling around the edges. If using frozen berries, add an extra 5–10 minutes. If the topping starts browning too quickly, tent loosely with foil.

6. Cool slightly before serving. Let the crumble rest for about 15 minutes before scooping, this helps the juices thicken and gives cleaner servings.

7. Serve. Spoon into small bowls and garnish with extra fresh raspberries and blackberries for that pop of color. Enjoy warm on its own or with a dollop of coconut yogurt or vanilla ice cream!

Proper Storage

This crumble is BEST the day you make it, when the topping’s nice and crisp and the berries are still a little bubbly. If you’ve got leftovers, let them cool first, then cover the dish or pop them into an airtight container and keep in the FRIDGE for up to 3 days.

To warm it back up, microwave a portion for about 20–30 seconds, or slide the whole dish into a 325°F oven for 10–15 minutes until it’s heated through.

Freezing? NOPE. The fruit goes watery and the topping gets soft… Honestly, it’s so quick to throw together you’re better off making a fresh batch when the craving hits!

Tip: Keep any fresh berry garnish separate and add it right before serving so it still looks bright and pretty.

See? We told you this recipe was as EASY as it is delicious! Juicy berries, a golden oat topping, and that cozy just-baked smell… it’s the kind of dessert (or breakfast, we won’t judge) that disappears fast!

If you give it a try, leave a comment, we’d LOVE to hear if you stuck with raspberries and blackberries or switched up the fruit. And if today’s not your baking day, save this PIN for later. Oh, and don’t forget to follow Panfetti on Pinterest for more quick and cozy recipes!