"Festive Christmas Cookie Bars are loaded with M&Ms, chocolate chips, and sprinkles. An easy, customizable one-pan holiday dessert!..."
INGREDIENTS
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1 (17.5 ounce) bag sugar cookie mix
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3 tablespoons brown sugar (packed)
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1/2 cup unsalted butter (softened)
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1 large egg
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2 teaspoons vanilla extract
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2/3 cup red and green M&Ms (divided)
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1/3 cup white chocolate chips (divided)
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1/3 cup semi-sweet chocolate chips (divided)
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3 tablespoons holiday sprinkles (divided)