Devil's Food Cupcakes with Dark Chocolate Frosting

Name: Devil's Food Cupcakes with Dark Chocolate Frosting
Prep time: 30 min
Cook time: 25 min
Total time: 55 min
Cuisine: American
Ingredients: ½ cup unsweetened cocoa powder; ½ cup light brown sugar (packed); 1 teaspoon instant coffee; 1 cup hot water; 1 stick softened butter (plus some for greasing if not using liners); ¾ cup sugar (superfine or granulated ); 1½ cups all-purpose flour; ½ teaspoons salt; ½ teaspoon baking powder; ½ teaspoon baking soda; 2 teaspoons vanilla extract; 2 eggs (at room temperature ); ½ cup butter (softened); 4 ounces cream cheese (softened); 4 ounces Dark chocolate (melted (see recipe notes)); 1 teaspoons vanilla extract; ¼ teaspoon salt (optional (to cut sweetness)); ½ cup unsweetened dark or black cocoa powder (sifted); 1½ cups powdered sugar (sifted); Black gel food coloring (optional (as needed))