Cold Caramel Sauce
["1/3 c. butter", "1 c. dark brown sugar", "1 egg, well beaten", "1/4 c. heavy cream, whipped", "1/2 tsp. vanilla"]
["Cream butter and sugar well; blend with egg.", "Fold in whipped cream and vanilla."]
["butter", "brown sugar", "egg", "heavy cream", "vanilla"]