HEAT oven to 350°F. Line 6 muffin cups with paper baking cups
SPOON cake mix into 1-cup measure; level top with straight edge. Place in medium bowl. Add water, oil and egg. Beat with mixer on low speed until moistened. Beat on medium speed 2 minutes. Divide evenly into prepared muffin cups.
BAKE 19 to 23 minutes or until toothpick inserted in center comes out clean. Cool 5 minutes. Remove from pan to wire rack to cool completely. Spread or pipe frosting on tops of cupcakes. Makes 6 cupcakes