Cream ¼ cup butter and ½ cup sugar. Sift flour, baking powder and salt. Add sifted dry ingredients to creamed mixture all at once along with milk. Stir briefly to blend.Spread batter into greased 8-inch square pan. Toss berries with remaining ¾ cup sugar; spoon on batter. Pour boiling water over top. Dot with 1 tbsp butter. Bake at 375°F for 45-50 minutes. Serve warm with ice cream, if desired.