Preheat oven to 374 degrees F. Grease an 8X8 pan.
Mix together flour, baking powder, sugar, butter, milk and egg in a stand mixer until smooth.
Fold in the blueberries.
Spread the batter into the pan.
Sprinkle the crumble mixture evenly on top of the batter
Bake for 45 minutes or until toothpick inserted comes out clean