How to Make It
Preheat a waffle iron with 4 compartments. Whisk together flour, baking powder, and salt in a large bowl.
Whisk together milk, butter, sugar, and eggs in a medium bowl. Add milk mixture to flour mixture stirring just until dry ingredients are moistened. (Batter will be lumpy.)
Coat waffle iron lightly with cooking spray. Pour about 2 cups batter into center of preheated waffle iron. Spread batter with a spatula to within ½-inch of edges. Cook until crisp and golden brown, 7 to 8 minutes. Repeat with remaining batter. (To keep waffles crisp, place on a wire rack on a baking sheet in a warm oven until ready to serve.) Serve with butter and fruit preserves.