How to Make It
Preheat oven to 400°F. Coat 2 (12-cup) muffin pans with cooking spray. Stir together sugar, flour, baking powder, and salt in a large bowl. Add eggs, milk, and melted butter; stir until just moistened. Stir in vanilla. Spoon batter evenly into prepared muffin pans, filling each cup about halfway.
Bake in preheated oven until a wooden pick inserted in centers of cakes comes out clean, 12 to 14 minutes. Remove cakes from muffin pan. Transfer to a wire rack; let cool completely, about 20 minutes. Sprinkle with powdered sugar.