Preheat oven to 350F. Line a 8”x8” pan with a parchment paper sling and set aside.
In a large bowl whisk together the egg, 1 teaspoon vanilla extract, melted butter and 1/3 cup of maple syrup. Add in the oat flour, oats, baking powder and salt and mix together until it forms a wet crumbly mixture.
Take about two thirds of the crumble mixture and place it in the prepared dish. Pat down the mixture evenly with your hands or a spatula.
In a small bowl toss together the fresh raspberries and 1 teaspoon tapioca starch. Add in 1 teaspoon vanilla extract and 2 tablespoons maple syrup and toss together, mashing a few raspberries as you mix.
Place the raspberry mixture evenly on the on top of the crust.
Sprinkle the remaining crumble mixture evenly on top.
Place in the oven and bake for 30 minutes until the topping is golden.
Cool on a wire rack and then cut into squares.