Marvelous Marble Cake
Ingredients: • 4 ounces bittersweet chocolate, chopped • 3 tablespoons plus 1-1/4 cups butter, softened, divided • 2 cups sugar • 5 large eggs, room temperature • 3 teaspoons vanilla extract • 2-1/4 cups all-purpose flour • 2 teaspoons baking powder • 1/2 teaspoon salt …