1Heat oven to 350°F (325°F for dark or nonstick pan). Generously grease and flour 12-cup fluted tube cake pan. Make cake batter as directed on box. Pour about 2 cups batter into pan. In small bowl, pour about 3/4 cup batter; stir in food color and peppermint extract. Carefully pour pink batter over white batter in pan. Carefully pour remaining white batter over pink batter.
2Bake and cool cake as directed on box.
3In small bowl, mix white icing ingredients. If necessary, stir in additional milk, 1 teaspoon at a time, until smooth and spreadable. Spread over cake. Sprinkle crushed candy on top. Store loosely covered.