Lulus Cupcakes

Name: Lulu's Cupcakes
Ingredients: 1 1/4 cups all-purpose flour; 2 teaspoons baking soda; 2 teaspoons baking powder; 1/4 teaspoon salt; 1 1/4 cups granulated sugar; 4 ounces unsweetened chocolate, chopped; 1 stick unsalted butter, cut into pieces; 2 teaspoons vanilla extract; 2 large eggs, lightly beaten; 4 tablespoons unsalted butter, at room temperature; 1 cup confectioners' sugar; 3 tablespoons heavy cream; 1 cup marshmallow creme; 6 ounces bittersweet chocolate, chopped; 1/2 cup heavy cream; 1 stick plus 1 tablespoon unsalted butter; 2 1/4 teaspoons vanilla extract; 1 tablespoon milk; 2 cups confectioners' sugar