Name: Chocolate Pudding Cupcakes
Prep time: 40 min
Cook time: 25 min
Total time: 1 h 5 min
Yield: 15 cupcakes
Ingredients: 3 ounces unsweetened chocolate, chopped; 2 ounces semisweet chocolate, chopped; 2 cups cake flour; 1/4 cup cocoa powder; 1 1/2 teasspoons baking soda; 1 teaspoon instant espresso powder; 1/2 teasoon salt; 1/2 cup buttermilk; 2 teaspoons vanilla extract; 2 cups firmly packed dark brown sugar; 2 sticks salted butter, at room temperature; 3 large eggs plus 1 egg yolk, at room temperature; 1 cup boiling water; 1/2 cup cornstarch; 1 1/2 cups water; 1 1/4 cups sugar; 1/2 cup Dutch-processed cocoa powder; 2 teaspoons light corn syrup; 4 tablespoons salted butter, at room temperature; 1 teaspoon vanilla; 2 ounces semisweet chocolate, finely chopped