Mint Chocolate cake

Ingredients:
1 chocolate cake mix

Frosting:
1/2 cup butter,softened
2 cups powdered sugar
1 Tablespoon water
1/2 teaspoon peppermint flavoring
3 drops green food coloring

Topping:
1-1/2 cups chocolate chips
6 tablespoons butter,softened
1/4 teaspoon peppermint flavoring

Prepare cake batter according to directions,using a greased 15x10x1 baking pan.Bake at 350 for 25-30 minutes or until a toothpick inserted in center comes out clean.Cool on wire rack.
In a large bowl,combine frosting ingredients until smooth.Spread over cooled cake.
For topping,in microwave,melt chocolate chips and butter;stirring until smooth.Stir in flavoring.Spread over frosting.Refrigerate until set.