Cinnamon Coffee Cake

1 1/2 cups flour
1 1/2 tsp. baking powder
1/2 cup 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 until fully blended. Beat egg, add to milk, and stir into the dry ingredients. Beat vigorously. Pour the mixture into a greased 8 inch square pan and then sprinkle generously with brown sugar and cinnamon. Bake 30 to 40 minutes in 400 degree oven.