Thankfully, it’s not only possible but it’s delicious. But take note! Margarine is sneaky. Most brands have whey, which is a dairy ingredient. Some brands also have gelatin, which is animal collagen.
Most recipes seem to call for some shortening, but quite frankly, that’s disgusting. So I just used an entire cup of vegan margarine, creamed it with my mixer, then added about 3 cups of powdered sugar, then mixed it some more. It looks a little questionable at this point, but don’t worry. You add a couple teaspoons of vanilla, then a tiny bit of soy or rice milk while beating until it’s smooth.
Lick the beaters.