The easiest triple berry crumble recipe + video, made with frozen fruit! Thickened frozen berries topped with an oat crumble topping. Ready in 10 minutes!

If you’re like me, you crave perfect spring berries all year long.

Thanks to this frozen berry crumble dessert, I can enjoy fresh berry desserts any time!

Steps of making triple berry crumble

Frozen fruit is best because it is frozen when it is at peak freshness. It has tons more flavor and nutrients.

Plus, frozen organic fruit is much cheaper than fresh. Win win!

scoop of berry crumble dessert

Since the berries are getting baked, it is perfect to use frozen berries. They’re going to get all soft and mushy anyway.

Even better? You can cook it with the berries frozen! No need to thaw them. You can have this frozen berry crumble prepped and in the oven in less than 10 minutes. Love that!

berry crumble dessert with 1 scoop taken out

To thicken the berries I add in some flour, along with a little sugar for added sweetness and lemon zest for added brightness.

The real star is the oat crumble topping. Crunchy and toasty oatmeal mixed with butter , flour and sugar. It is amazing.

Berry crumble topped with ice cream

Top this frozen fruit crumble with some ice cream, and you’ve got the easiest and most amazing dessert to serve to guests or your family!

Watch Crumble Recipe Video (57 seconds)


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Easiest Triple Berry Crumble (made with frozen fruit!)

  • Author: Tastes Lovely
  • Prep Time: 10 mins
  • Cook Time: 60 mins
  • Total Time: 1 hour 10 mins
  • Yield: 6 servings 1x



Berry Filling

  • 4 cups frozen mixed berries*, NOT thawed (about 24 ounces frozen fruit)
  • 3 tablespoons granulated sugar
  • 3 tablespoons all purpose flour
  • zest from 1 lemon
  • pinch of salt

Oat Crumble Topping

  • 1 cup old fashioned rolled oats
  • 1/2 cup brown sugar
  • 6 tablespoons all purpose flour
  • 1 stick (1/2 cup) salted butter, cold, cut into small cubes


  1. Preheat oven to 350 degrees with the oven in the middle position.
  2. In a mixing bowl, make the berry filling by combining all ingredients and tossing to combine. Set aside.
  3. In a separate mixing bowl, make the oat crumble by combining all ingredients, then use your fingers to pinch the butter and incorporate with the dry ingredients. Keep pinching and tossing together with your hands until evenly combined. You will be left with many pea sized pieces of butter mixed in with the oat mixture. Set aside.
  4. Pour the berry filing into a 1-1/2 quart baking dish (or 8×8 pyrex baking dish, a pie baking dish, or even cast iron skillet). Top with the oat crumble topping, and spread to an even layer.
  5. Bake uncovered until the berry filling is bubbling, and the oat crumble is golden brown, about 1 hour. Let cool for 1 hour before serving. Serve room temperature with ice cream. Will keep covered at room temperature for 3 days.


My favorite frozen berries to use are a combination of raspberries, blueberries and blackberries. I buy a big bag of this frozen triple berry mix and always have it in my freezer. But you could use just 1 berry, or any combination of other berries. For larger fruit/berries like strawberries, cherries, mango, etc I will pulse the frozen fruit in the food processor a few times so the chunks are more bite size

This same recipe also works for fresh fruit too! Just substitute the same amount of fresh berries for frozen.

You can make this up to step 4, then cover tightly and freeze up to 3 months. Bake it fully frozen until golden and bubbling, about 1 hour also.


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