Step 1

Preheat the oven to 375F.

Step 2

Toss the berries with the corn starch, sugar and cinnamon.

Step 3

Pour the berry mixture into a round pie or tart dish.

Step 4

Combine the flour, oats, sugar, brown sugar, cinnamon, and vanilla extract in a mixing bowl.

Step 5

Melt the butter and add it to the dry ingredients.

Step 6

Stir to combine.

Step 7

Using your fingers, sprinkle the crumble topping evenly on top of the berry mixture.

Step 8

Bake for 40 minutes or until the berries are cooked down and bubbly, and the topping is browned to your liking.