1Heat oven to 375°F (350°F for dark or nonstick pan). Place paper baking cup in each of 24 regular-size muffins cups.
2In large bowl, beat cake mix, bananas, water, butter and eggs with electric mixer on low speed 30 seconds, then on medium speed 2 minutes, scraping bowl occasionally. Stir in chocolate chips. Spoon batter evenly into muffin cups.
3Bake 18 to 24 minutes or until toothpick inserted in center comes out clean. Remove from pan to cooling racks. Cool completely, about 30 minutes. Frost cupcakes with frosting. Store loosely covered.