Blueberry Cake

2 cups flour

3 tsp baking powder

1/2 tsp salt

1 cup sugar

1/4 cup butter

1 egg

1 tsp vanilla

3/4 cup milk

2 cups blueberries

Topping: 

1/2 cup flour

1/4 cup brown sugar

1/4 cup butter. 

Cream sugar, butter, egg, and vanilla; add milk; add dry ingredients, spread half the batter, spoon blueberries over batter. Spread rest of batter over blueberries. Mix topping and put on top of batter. Bake at 375 degrees for 45 minutes.