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– 3 ¼ cups all-purpose flour or the gluten-free baking mix listed below* – 1 teaspoon baking soda – ½ teaspoon cream of tartar – ½ teaspoon salt – 1 cup unsalted butter softened – 1 cup brown sugar – ¾ cup + 2 tablespoons granulated sugar – 2 large eggs room temperature – 1 tablespoon pure vanilla extract – 2 ½ cups M&M – additional M&Ms to press on top optional *For the gluten-free baking mix: – 2 cups rice flour – ⅔ cup potato starch – ⅓ cup tapioca flour – 1 teaspoon xanthan gum
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