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1. Preheat oven to 350 degrees and grease a 9X14 pan.
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2. Mix cake mix, eggs, oil, milk and vanilla extract until smooth.
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3. Fill pan and bake for 20-25 minutes or until an inserted knife comes out clean.
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4. Let cool.
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5. Poke holes using the end of a wooden spoon all over cake (about 30 holes).
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6. Pour sweetened condensed milk over cake and spread out so that it fills the holes.
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7. Heat the hot fudge in the microwave (just enough so that it's pourable) and stir in peppermint extract and half of the crushed Thin Mints. Pour over cake and spread out.
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8. Let cool for 5 minutes and then spread whipped topping on top and finish with the rest of the crushed Thin Mints! Refrigerate until ready to serve! (I kept mine in the fridge overnight and served in the next day!!