Never Fail Caramel Icing
["3 Tbsp. butter", "6 Tbsp. white sugar", "9 marshmallows", "1 1/2 c. confectioners sugar", "6 Tbsp. brown sugar", "1 1/2 tsp. vanilla", "1/2 c. cream"]
["Mix butter, brown and white sugar and cream.", "Bring to a boil and cook rapidly for 2 minutes.", "Remove from heat; add marshmallows.", "When they have melted, add vanilla and sifted confectioners sugar.", "Stir until thick enough to spread over layers of cake."]
["butter", "white sugar", "marshmallows", "confectioners sugar", "brown sugar", "vanilla", "cream"]