1Heat oven to 350°F. Make cake batter as directed on box. Fill 12 cones about half full of batter. Stand cones in muffin pan. Refrigerate any leftover batter until ready to fill and bake remaining cones.
2Bake 21 to 26 minutes or until toothpick carefully inserted in center comes out clean. Cool completely, about 1 hour.
3Frost with frosting and decorate. Store loosely covered.