Costco Mousse My co-worker turned me on to this recipe. When you go to the link, you'll see it's called "Costco Mousse" because it was written by a former Costco employee. I don't have a better name for it, so I will refer to it as "Costco Mousse" as well. It's your basic instant pudding recipe except substitute half your milk with heavy whipping cream. When I first tried this on my BMW cake, I wasn't sure what to expect. In the beginning, it was all liquidy and unappealing. Whip this sucker…