Preheat oven to 350 degrees.
In a medium-sized bowl, combine oat flour, oats, baking powder and cinnamon. Add in egg (or mashed banana and apple sauce and stir until mixture is well combined.
Spray a glass pan or jelly roll pan with cooking spray. Spread crust mixture in an even layer. Bake for about 15 minutes, or until crust is lightly golden.
For filling, place 1.5 cups blueberries in a food processor and pulse until chunky (blueberries shouldn't be fully pureed). Place in a bowl and add in chia seeds, maple syrup, lemon juice and zest.
Spread evenly on top of crust and then scatter remaining 1/2 cup blueberries on top. Bake for 15 minutes.
Let cool and slice.
Enjoy!!