Actually, it's rather supported in many OAMC groups.
I've cooked mashed potatoes, measured them in cupcake tins, & froze as individual servings.
Now I use a vacuum sealer too, but even before that it worked fine. I throw what I need into the microwave, stir, & sometimes add a little milk. So far so good. When I first considered freezing like this, I checked all kinds of university & federal sites for info on vegetable freezing. All of them said it was ok. Changes occur if you don't cook the potatoes first.