Cream shortening and 3/4 cup sugar. Add egg and beat until light and fluffy. Sift together 2 cups flour, baking powder and salt. Add to creamed mixture alternately with milk. Spread in greased 11" x 7" x 1 1/2" baking pan. Top with blueberries. Mix together 1/2 cup sugar, 1/2 cup flour and nutmeg. Cut in butter until crumbly. Sprinkle over blueberries. Bake at 350 degrees for 45 minutes. Cut in squares. Serves 6-12