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Preheat oven to 375F. Line 2 baking sheets with parchment paper.
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In a bowl, beat together brownie mix, eggs, flour, vegetable oil, and water until combined. Fold in about ½ of the M&M'S®. Drop by heaping tablespoons onto the prepared baking sheets.
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Bake 9 - 10 minutes in the preheated oven, until the tops are crackly. Cool completely.
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Spread generously with the frosting and sprinkle with reserved M&M'S®.