Cinnamon Coffee Cake

1 1/2 cups flour
1 1/2 tsp. baking powder
1 1/2 cups granulated sugar
1/2 tsp. salt
4 Tbsp. butter
1 egg
2/3 cup milk
1/2 cup brown sugar
1 1/2 tsp. cinnamon

Sift - flour, baking powder, sugar, and salt together. Cut in butter. Beat egg, and to milk and stir into dry ingredients. Beat vigorously.