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1. Preheat oven to 350 degrees and grease 2- 9 inch pans (or 8 inch pans are my fav).
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2. Combine cake mix, eggs, butter, milk, sour cream and vanilla extract until smooth and then pour into pans and spread out evenly.
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3. Bake for 17-22 minutes or until an inserted knife comes out clean.
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4. Let cool.
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5. Thin Mint Frosting: Beat butter until smooth. Add vanilla, peppermint, milk, and 2 cups powdered sugar. Continue to add powdered sugar until you reach your desired consistency (you'll want it spreadable). Use food dye to get a green color and then stir in your crushed Thin Mints.
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6. Frosting cooled cake and top with extra Thin Mints and chocolate sauce (mine was just store bought but you can make a ganache using chocolate chips and cream!)