Berry Crumble Pie

Ingredients

• 2 cups raspberries (fresh or frozen)
• 2 cups blueberries (fresh or frozen)
• 2 cups blackberries (fresh or frozen)
• 1/2 cup sugar
• 1/4 cup cornstarch
• 1 tbsp lemon juice
• 6 Tbsp butter or vegan butter, cut into tiny cubes
• 1/2 cup brown sugar
• 1/2 cup flour (gluten free all purpose flour)
• 3/4 cup gluten free rolled oats
• pinch salt