Preheat and lightly grease waffle iron according to manufacturer's directions. Combine muffin mix, flour and baking powder in a large bowl. Add milk, eggs and melted butter. Stir until moistened. (about 50 strokes) Pour batter onto center grids of preheated waffle iron. Bake according to manufacturer's directions until golden brown. Remove baked waffle carefully with fork. Repeat with remaining batter. Dust lightly with sugar, if desired. Top with fresh fruit, syrup, grated chocolate or whipped cream, if desired. Makes 10-12 waffles