Easy Three-Berry Crumble Slab Pie

This informal 3-berry slab pie with a crumble topping serves a crowd and is baked on a sheet pan! Use frozen berries for a fresh-tasting dessert any time of year.

• Preparation Time: 15 mins
• Cooking Time: 45 mins
• Total Time: 60 mins
• Calories: 283 Calories

Ingredients

• 1 cup all-purpose flour
• 2 tablespoons all-purpose flour
• 1 teaspoon apple pie spice
• 1 cup rolled oats
• 2 9-inch pie crusts
• 7 tablespoons cold unsalted butter
• 7 cups frozen mixed berries (blackberries, blueberries, and raspberries)
• 0.5 teaspoon salt
• 0.75 cup packed light brown sugar
• 0.75 cup granulated sugar
• 0.33333334326744 cup arrowroot powder

Recipe Instructions

Step 1

Preheat the oven to 375 degrees F (190 degrees C).

Step 2

Lightly dust an 11x15-inch half-sheet pan with flour. Carefully place the 2 pie crusts into the bottom of the sheet pan, gently stretching and trimming the crusts to fit the bottom and up the sides of the pan.

Step 3

Combine berries, sugar, arrowroot powder, and salt in a large bowl; stir well.

Step 4

Combine oats, flour, brown sugar, apple pie spice, and salt in a medium bowl. Use a pastry knife to cut butter into the oat mixture until butter is evenly distributed throughout and the crumble topping mixture resembles small, uneven pieces.

Step 5

Pour berry mixture evenly onto the crust and add crumble mixture on top.

Step 6

Bake in the preheated oven until brown and bubbly, 45 to 55 minutes. Remove and allow to cool for 30 to 45 minutes