Line the bottom of a 9 X 13 dish with Oreos. Pour the Eagle-brand Milk over the Oreo's.
Spread the Cool Whip on top of the Milk and Oreos.
Spread the Cake mix on top of the Cool Whip. Cut the butter into small squares, and lay the squares on top of cake mix.
Sprinkle 3/4 cup of the M and M's on top of the butter.
Bake at 350 for 45 minutes. Remove from oven to a wire rack to cool.
Notes
MINT M&M'S: Enhance your mint flavor by using Mint M&M's.Serving Suggestions: You can serve so many things with this Mint Chocolate cake, for example: ice cream, chocolate or mint chocolate chip, peppermint frosting, or whipped cream.Variation tip: Gluten Free Funfetti cake mix can be utilized.Alternate cooking method tip: Make in your slow cooker, put on high for two hours.Alternate ingredient: If you cannot find mint oreos, any chocolate mint cookie will work.