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Preheat the oven to 350 degrees.
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Prep sugar cookie mix according to package directions and press into bottom of a 9x13 inch pan.
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Prepare brownie mix according to package directions and add mint extract. Pour over sugar cookie layer. Sprinkle with semisweet chocolate chops.
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Bake at 350 degrees for 25-30 minutes. Cool. Slice bars.
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Melt white chocolate chips per package directions. Drizzle white chocolate over bar cookies.
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Decorate with sprinkles and M&M's White Chocolate Peppermint candies.
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Store in Glad containers, bags or wraps.