Mixed Berry Crumble

Name: Mixed Berry Crumble
Prep time: 20 min
Cook time: 45 min
Total time: 65 min
Ingredients: 500 grams frozen mixed berries; 40 grams cane sugar; 40 grams plain white flour; ½ lime (juice and zest); 1 teaspoon vanilla paste; 1 tablespoon maple syrup; 100 grams rolled oats; 100 grams plain white flour; 100 grams brown sugar; 120 grams butter (cubed, salted); ½ teaspoon sea salt

Jammy and sweet mixed berry crumble with a delightfully crisp streusel topping.

By Sine

Published Mar 02, 2026

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We all love an easy, crowd-pleasing dessert, and this Mixed Berry Crumble with a buttery streusel topping and jammy berry filling is exactly that.

A Mixed Berry Crumble baked to perfection, topped with three scoops of vanilla ice cream in a white dish, with an ice cream scoop and oats nearby on a gray surface.

It only takes 20 minutes to throw together, and the best part is the recipe calls for frozen berries, so you can make this crumble all year round. Prepare it in advance, and bake it right before your guests arrive.

This comforting treat is delicious enjoyed warm or cold. Top it with ice cream, whipped cream, custard, or sour cream.

❤️ Why You’ll Love Mixed Berry Crumble

Crowdpleasing and easy-to-make ahead.
Serve it warm or cold all year round.
Freezer-friendly.
Egg-free and can be made gluten-free.

A baked fruit crumble dessert in a white round dish, topped with a golden-brown oat topping.

Mixed Berry Crumble Ingredients

Please be sure to scroll down to the recipe card below for the complete details!

For the berry filling:

Frozen mixed berries: I use a combination of blackberries, raspberries, blueberries, blackcurrants, red currants, and strawberries. Use them straight out of the freezer.
Plain white flour: Use flour to coat the berries, thicken the filling, and prevent it from becoming too watery.
Cane sugar: Adds sweetness to the berries.
Maple syrup: Offers a slight caramel flavor.
Lime: I prefer organic lime (since we need both the zest and the juice).
Vanilla paste: You can use vanilla sugar, vanilla extract, or a vanilla pod instead.
Sea salt: Balances and enhances all the other flavors.

For the crumble topping:

Plain white flour: You’ll need all-purpose flour. This forms the base of the crumble.
Rolled oats: The finer, ready-to-eat oats. Adds crunch.
Dark brown sugar: Or cane sugar.
Butter: Use softened, salted cold butter. Unsalted butter is fine, too.

Ingredients for a berry crumble recipe arranged on a gray surface, including oats, sugars, butter, and syrup in glass bowls, with frozen mixed berries, flour, lime, and vanilla paste.

How to Make Mixed Berry Crumble

Make the berry filling: Mix frozen berries with 40 grams of flour, cane sugar, maple syrup, vanilla paste, lime juice, and lime zest, ensuring the berries are well coated in the flour mixture.
Make the topping: Combine oats, 100 grams flour, brown sugar, and sea salt with butter until it resembles large clumps. I like to do this part by hand.
Assemble the crumble: Fill a baking dish with the berry mixture, top it with the crumble.
Bake: Bake at 180°C (356°F) fan for about 45 minutes until bubbly and golden.

A bowl of frozen mixed berries being stirred with a spoon on a gray surface.

Bowl filled with crumbly oat, flour, butter, and brown sugar mixture.

Possible Variations

Berries: Use any combination of berries, apples, rhubarb, pears, or stone fruits. Fresh berries are fine to use too, but the cooking time and consistency may vary.
Cane sugar: Granulated sugar (white sugar) or even light brown sugar is fine, too.
Plain white flour: Substitute cornstarch for flour in the filling.
Lime: Feel free to swap for lemon juice and lemon zest (even orange would be delicious).
Oats: You can omit and use all flour.
Butter: There’s no real alternative to butter.
Spices: Try cinnamon, ginger, cloves, cardamom, chopped chocolate, or nuts.
Presentation: Divide and bake the crumble in ramekins for individual desserts.

How to Store Leftovers

Keep leftovers in an airtight container in the refrigerator for up to 3 days.

FAQs

Can I make this gluten-free?

Yes, swap plain white flour for your favorite gluten-free flour. You may need to adjust the amount of flour if it’s extra absorbent.

Do I need to use frozen berries for this recipe?

Yes, use frozen berries straight from the freezer. They need no preparation, and the result is a tasty jammy filling.

Can I make this recipe all year round?

For sure! Since frozen berries are always in season, you can make this anytime of the year!

Is this crumble freezer-friendly?

You can freeze the crumble baked for up to three months. Thaw it in the fridge overnight, or reheat it directly in the oven at 180°C (356°F) fan for about 15-20 minutes until heated through.

Can I use a food processor?

Absolutely! Use it to make the crumble dough (keep it on low speed).