"Chewy M&M's Chocolate Chip Cookie Bars are thick and delicious and perfect when you need a quick dessert. Perfect for holidays and bake sales too!..."
INGREDIENTS
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1 cup unsalted butter, softened
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1 cup granulated sugar
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1 cup light brown sugar, packed
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2 large eggs
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1 large egg yolk
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2 tsp vanilla extract
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3 cups all-purpose flour
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1 tsp baking soda
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1 tsp cornstarch
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1 tsp kosher salt
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1 1/2 cups semi-sweet chocolate chips
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1 1/2 cups M&M's candies (any color or variety)