Prepare the crumble layer by combine in a clean bowl, the flour, quick oats, brown sugar, cinnamon, salt, and baking powder. Stir to combine.
1 cup Quick Oats, ¾ cup All Purpose Flour, ¾ cup Brown Sugar, ½ teaspoon Salt, ½ teaspoon Ground Cinnamon, ½ teaspoon Baking Powder