"These are the best patriotic sheet pan, red, white, and blue M&M's cookie bars. They are insanely soft and packed with mix-ins...."
INGREDIENTS
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1 cups unsalted butter (softened)
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1 & 1/2 cups light brown sugar (packed )
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½ cup granulated sugar
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3 large eggs
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1 tablespoon cornsyrup
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2 tablespoons pure vanilla extract
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3 1/4 cups all-purpose flour
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1 tablespoon cornstarch
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3/4 teaspoon baking soda
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1/4 teaspoon baking powder
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1 teaspoon salt
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1 cups semi-sweet chocolate chips
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1 cups red white and blue M&Ms (or any variety you like!)