Stir the dry ingredients together in a large bowl.
Stir in the blueberries.
Mix the egg, milk and butter together with a fork in a smaller bowl.
Add wet ingredients to the dry ingredients. Gently stir until well combined.
Pour into 8" greased pan.
Combine topping ingredients and put on top of cake batter.
Bake 425 degrees for 30-40 minutes or until a toothpick comes out clean.