Good-Cooking - Low-Fat Snickerdoodles

Ingredients

• 1/3 cup butter, softened
• 1 cup granulated sugar
• 3 egg whites
• 2 3/4 cups flour
• 2 teaspoons cream of tartar
• 1 teaspoon baking soda
• 1/4 teaspoon salt
• 2/3 cup low-fat buttermilk
• 2 teaspoons ground cinnamon
• 2 tablespoons granulated sugar