1/4 cup butter or margarine
3/4 cup granulated sugar
1 egg
2 cups flour
2 teaspoons baking powder
1/2 cup milk
2 cups fresh blueberries

Crumb Topping
1/4 cup soft butter
1/2 cup granulated sugar
1/3 cup flour
1/2 teaspoon cinnamon

Cream butter; add sugar and beat until light. Add egg and beat well. Add dry ingredients alternately with milk; beat until smooth. Fold in blueberries. Pour into greased 9-inch square pan.

Crumb Topping: Blend butter, sugar, flour and cinnamon. Sprinkle on buckle. Bake at 375 degrees F for 35 minutes.