Chocolate Frosting Glaze
["1/2 stick butter", "2 Tbsp. cocoa", "3 Tbsp. milk", "1/2 tsp. vanilla", "1/2 box powdered sugar"]
["Bring butter, cocoa and milk to a boil.", "Remove from heat; add vanilla and powdered sugar.", "Beat with mixer and pour over baked cake."]
["butter", "cocoa", "milk", "vanilla", "powdered sugar"]