Streusel Cake

1/2 cup butter
1/2 cup sugar
1 egg
1 1/2 cups flour
2 tsp baking powder
1/2 tsp salt
3/4 cup milk
1/2 cup brown sugar
1 tbsp flour
3 tbsp butter

Cream 1/2 cup butter, sugar, and egg. In a seperate bowl, mix together flour, baking powder, and salt. Alternating adding dry ingredients and milk to the cream mixed and mix just until combined. Pour into a greased 9" x 9" pan. Mix brown sugar, 3tbsp butter, and flour and drop by spoonfuls onto batter. Bake at 375F for 35 minutes.