OK, I made a 13x9 pan of carrot cake and the icing recipe calls for 8oz of cream cheese and 1lb of icing sugar. Um...that seems like a LOT of icing to me. Think I'd be OK with doing 4oz of cream cheese and a cup and a half (ish) of icing sugar?
I'd half the frosting recipe Alix and add more as needed to avoid leftovers.