Peppermint Sandwich Cookie Filling
Recipes Dessert American Photo by Posie (Harwood) Brien Prep time 10 minutes Makes enough for 18 sandwich cookies Author Notes Minty and sweet, this is my favorite filling for homemade Oreo cookies. —Posie (Harwood) Brien Test Kitchen-Approved Ingredients 1/2 cup unsalted butter, softened 1 1/2 cups confectioners’ sugar 1/4 teaspoon peppermint extract pinch sea salt…