Name: Peanut Butter Oatmeal Sandwich Cookies with Marshmallow Creme Filling
Prep time: 30 min
Cook time: 10 min
Total time: 40 min
Yield: 12 sandwich cookies
Ingredients: 1 stick (½ cup) unsalted butter (softened); ¾ cup firmly packed light brown sugar; ¼ cup granulated sugar; 1 tablespoon vanilla extract; ½ cup creamy peanut butter; 1 large egg; ¾ cup quick oats; 1 cup all-purpose flour; ½ teaspoon baking powder; ½ teaspoon baking soda; ½ teaspoon cinnamon; ½ teaspoon salt; 7 oz. jar Marshmallow Fluff; ½ cup (1 stick) unsalted butter (softened); ⅓ cup powdered sugar; 1 tablespoons vanilla extract; ⅛ teaspoon salt