Blueberry Buckle

1/4 cup butter, softened
3/4 cup sugar
1 egg
2 cups flour
2 tsp. baking powder
1/4 tsp. salt
1/2 cup milk
2 cups fresh blueberries

In a small mixing bowl, cream butter and sugar. 
Beat in the egg. 
Combine the flour, baking powder and salt; add to creamed mixture alternately with milk.
Fold in the blueberries. 
Pour into greased 9 inch square baking pan
2/3 cup sugar
1/2 cup flour
1/2 tsp. cinnamon
1/3 cup cold butter

Combine sugar, flour and cinnamon in a bowl; cut in butter until crumbly. 
Sprinkle over blueberry mixture.
Bake at 375 degrees for 40-45 minutes or until a toothpick inserted near the center comes out celan. 
Cool on a wire rack.