Name: Spiderweb Sandwich Cookies with Marshmallow Buttercream Filling
Ingredients: 1 1/2 cups unsalted butter (3 sticks, at room temperature); 1 cup sugar; 1/2 teaspoon salt; 1 tablespoon vanilla extract; 2 large eggs (at room temperature); 3 1/2 cups all-purpose flour; 1/2 cup unsweetened cocoa powder; Sugar sprinkles (if desired); 1/2 cup unsalted butter (1 stick, at room temperature); 2 cups powdered sugar; Pinch of salt; 1 teaspoon vanilla extract; 7 ounces marshmallow cream