Heat oven to 350°F. Prepare cake mix as directed on package. Spoon 2 to 3 tablespoons batter into each ice-cream cone, filling each about 1/2 full. Place cones in 13x9-inch rectangular pans. Bake 20 to 25 minutes or until tops spring back when touched lightly in center; cool. Frost with frosting. Decorate as desired.