Heat oven to 350°F (325°F for dark or nonstick pans). Place paper baking cup in each of 24 regular-size muffin cups. Make cake mix as directed on box, using water, oil and eggs. Divide batter among muffin cups. Bake 17 to 22 minutes or until toothpick inserted in centers comes out clean. Cool in pans 10 minutes; remove from pans to cooling racks. Cool completely, about 30 minutes.