Name: Chocolate Fudge S’mores Thumbprints
Yield: 20 cookies
Ingredients: 1/2 cup butter, (at room temperature); 1/4 cup packed brown sugar; 2 tablespoons granulated sugar; 1 teaspoon vanilla extract; 1/4 teaspoon salt; 1 egg yolk; 3/4 cup all purpose flour; 1/4 cup unsweetened cocoa powder; 1/2 mini chocolate chips; 1/2 batch of marshmallow frosting; 1/4 cup graham cracker crumbs, (or more if desired)