Preheat oven to 350°F. Line muffin tin with paper liners or spray with non-stick cooking spray.In the bowl of a stand mixer or a large bowl with a hand mixer, add the cake and pudding mixes, sour cream, oil, eggs, vanilla and water. Mix on medium speed for about 2 minutes until all ingredients are well combined and the batter is smooth. Stir in the Andes Crème de Menthe baking chips.Using a large scoop distribute the batter between 24 muffin wells; about 3 tablespoons of batter per well.Bake in preheated oven for 18-23 minutes or until the tops of the cakes spring back when lightly touched. Allow cupcakes to cool inside muffin tins for about 10 minutes.Remove cupcakes from muffin tins and allow to fully cool on a wire rack. Once cupcakes are cool, prepare your frosting.For the FrostingIn the bowl of a stand mixer fitted with the paddle attachment, beat the butter on medium-high speed for about 5 minutes.Turn the mixture down to low speed and gradually add in the confectioners’ sugar until it is completely incorporated. Add in vanilla and heavy cream. Turn the mixer back up to medium-high speed and beat the mixture for about 3-4 minutes or until light and fluffy.Remove half of the frosting from the mixer bowl and set aside. Add a tiny amount of green gel dye to the remaining frosting (I used Wilton Leaf Green). Turn the mixer on and fully incorporate the dye. Slowly add more dye until you achieve a nice minty green color. Stir in peppermint extract.Remove the mint frosting from the mixing bowl and set aside. Add the other half of the frosting back into the bowl of your stand mixer. Add in the cooled, melted chocolate and cocoa powder. Mix until fully incorporated.For the two-toned effect, I used this method from GoodLife Eats. You can also carefully layer the two colors into the piping bag, but I find Katie’s method to be much easier and cleaner.Pipe the frosting onto the cooled cupcakes and garnish with mini chocolate chips.