Old Fashioned Iced Fudge Brownies

Name: Old Fashioned Iced Fudge Brownies
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Cuisine: American
Ingredients: 2 sticks (1 cup ) salted butter; 2 cups semi-sweet chocolate chips; 1 cup granulated sugar; 1 tablespoon vanilla extract; 1 tablespoon instant coffee granules; 4 large eggs, at room temperature; 1/2 cup all-purpose flour; 1/2 cup unsweetened cocoa powder; 1 teaspoon baking powder; 1 stick (1/2 cup) salted butter, at room temperature; 2-3 cups powdered sugar; 1/2 cup cocoa powder; 2 teaspoons vanilla extract; 1/4 cup warmed milk; sprinkles, for decorating (optional)