Blueberry buckle

A Canadian dessert well worth a try blackberries work as well

1/4 cup butter, softened
3/4 cup sugar
1 egg
2 cups all-purpose flour
2 teaspoons baking powder
1/4 teaspoon salt
1/2 cup milk
2 cups fresh blueberries
TOPPING:
2/3 cup sugar
1/2 cup all-purpose flour
1/2 teaspoon ground cinnamon
1/3 cup cold butter, cubed

In a small bowl, cream butter and sugar until light and fluffy. Beat in egg. Combine the flour, baking powder and salt; add to creamed mixture alternately with milk, beating well after each addition. Fold in blueberries. Pour into greased 9-in. square baking pan.For topping, in a small bowl, combine the sugar, flour and cinnamon; cut in butter until crumbly. Sprinkle over blueberry mixture.Bake at 375° for 40-45 minutes or until a toothpick inserted in the center comes out clean. Cool on a wire rack.