I'm on a time crunch and want to make a frosting consisting of only shortening, powder sugar and vanilla extract. Will this last 3 weeks on the counter?
I am not using butter as the recipient is allergic to dairy.

No, it can still turn rancid.

Theresa

Just make it and freeze it, until you need it. I do it all the time, no matter what kind of icing i make. hth

It will surely freeze well.

My recipe is p.sugar, milk, vanilla, crisco and dream whip. I leave it on the counter for days and days and days and days and ......

Holds up fine. Doens't turn rancid. Before each use I just use a big spoon and give it a big stir. Actually, the longer it sits, the smoother it gets and easier to work with.

Somebody on here that used to work at Sam's Club said their BC is labelled for a room temp shelf life of 6-8 months. (you'll definitely know when shortening goes rancid.)