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Mixed Berry Crumble

Mixed Berry Crumble, Sweet, juicy berries baked under a golden oat topping — the perfect easy dessert!

This Mixed Berry Crumble is everything you want in a dessert: warm, juicy, fruity, and topped with the most irresistible brown sugar oat crumble.

It’s rustic and homey — the kind of dessert that feels like a big hug. Whether you’re working with fresh berries at the height of summer or using frozen ones from your freezer stash, this recipe delivers every single time.

Best part? It’s incredibly simple to make — no mixer, no fancy tools, and no pie crust required.

Why You’ll Love This Recipe:

• Quick & easy: Just toss, top, and bake!
• Flexible: Works beautifully with fresh or frozen berries.
• Crispy topping: That oat-studded crumble is absolute perfection.
• Perfect for any occasion: From weeknight dessert to summer cookouts.

Ingredients:

For the Berry Filling:

• 4 cups mixed berries (fresh or frozen — blueberries, strawberries, raspberries, blackberries)
• 1/3 cup granulated sugar (adjust to taste)
• 1 tablespoon lemon juice
• 2 tablespoons cornstarch
• 1 teaspoon vanilla extract

For the Crumble Topping:

• 3/4 cup old-fashioned oats
• 1/2 cup all-purpose flour
• 1/3 cup brown sugar
• 1/4 cup granulated sugar
• 1/2 teaspoon cinnamon
• 1/4 teaspoon salt
• 1/2 cup unsalted butter, cold and cubed

Instructions:

1. Preheat the Oven

Preheat oven to 350°F (175°C). Lightly grease an 8×8 or similar-sized baking dish.

2. Make the Berry Filling

In a large bowl, combine the mixed berries, sugar, lemon juice, cornstarch, and vanilla. Toss gently until the berries are well-coated. Pour into the prepared baking dish and spread into an even layer.

3. Make the Crumble

In a separate bowl, stir together oats, flour, brown sugar, granulated sugar, cinnamon, and salt. Add the cold, cubed butter and use your fingers or a pastry cutter to work it in until the mixture resembles coarse crumbs.

4. Assemble & Bake

Sprinkle the crumble topping evenly over the berry mixture. Bake for 35–40 minutes, or until the topping is golden brown and the berries are bubbling.

5. Cool Slightly & Serve

Let the crumble cool for 10–15 minutes. Serve warm with a scoop of vanilla ice cream, whipped cream, or a drizzle of heavy cream.

Tips & Swaps:

• Use frozen berries: No need to thaw — just add 1 extra teaspoon of cornstarch.
• Add nuts: Toss in chopped pecans or walnuts to the topping for extra crunch.
• Make ahead: You can assemble it up to 24 hours in advance and bake when ready.

What to Serve With Mixed Berry Crumble:

• Vanilla bean ice cream (classic!)
• Homemade whipped cream
• Greek yogurt or crème fraîche for a tangy twist
• A mug of hot tea or coffee

Final Thoughts:

There’s something magical about the combination of warm berries and buttery crumble — it’s cozy, nostalgic, and downright delicious. This Mixed Berry Crumble is a go-to for any time you want a low-effort, high-reward dessert that tastes like it came from Grandma’s kitchen. For more dessert inspiration be sure to check out our desserts page for more than 400 recipes.