For topping, stir together flour, the 1/2 cup granulated sugar, and the baking powder. Add milk and the 1/4 cup butter or margarine all at once. Stir until smooth; set aside.

For filling, in a medium saucepan stir together brown sugar and cornstarch; stir in water. Add peaches and blueberries. Cook and stir over medium heat until thickened and bubbly. Add the 1 tablespoon butter or margarine and the lemon juice; stir until butter or margarine melts. Pour into an ungreased 1-1/2-quart casserole. Spoon topping in mounds over hot filling; spread evenly over filling. Sprinkle with a mixture of the 2 tablespoons coarse sugar and the nutmeg or cinnamon. Place on a shallow baking pan in oven.

Bake cobbler in a 350 degree F. oven about 35 minutes or until bubbly and a toothpick inserted into topper comes out clean. Serve warm with ice cream, if desired. Makes 6 servings.

Prepare and bake cobbler as above, except substitute 3 cups drained canned peach slices for the fresh peaches, 1 cup frozen blueberries for the fresh blueberries, and 1/2 cup syrup from the canned peaches for the cold water.