Preheat oven to 350 Degrees Fahrenheit.
In a large bowl, mash your bananas. Pour in almond milk, oil and vanilla and stir until fully combined. Sift in the flour, sugar, baking powder, protein powder, and salt.
Once dry ingredients are almost fully combined in batter, stir in the blueberries. Stir just to combine.
Pour batter into greased 13x9inch pan.
Create crumble topping by mixing together the melted vegan butter, coconut sugar, flour, and cinnamon. Add this on top of the batter in the pan.
Bake for 45 minutes or until a toothpick comes out clean. Let cool completely before cutting and enjoying!