These Nutter Butter Cookies are an addictively delicious homemade version of classic peanut butter sandwich cookies! 🥜🍫 Ingredients For the Cookies 1/2 cup unsalted butter, softened 1/2 cup creamy peanut butter 1/2 cup packed light brown sugar 1/2 cup granulated sugar 1 large egg 1 teaspoon vanilla extract 1 1/2 cups all-purpose flour 1/2 teaspoon baking soda 1/4 teaspoon salt For the Peanut Butter Filling 1/2 cup unsalted butter, softened 1 cup creamy peanut butter 1 cup powdered sugar 1/4 cu