Bursitis has completely stopped me from using my left arm. I was trying to think about what could be cooked with just one arm.
This is where pantry clean out met up with my upcoming Sunday edition Heathcliff edit. I can cook spam with just one arm.
The only scratch made element in this is some mustard seed caviar I made a while back. I put some of it in the spice blender to cream it up a little. It went excellent with this otherwise depression causing meal.
Cost per person: $4
It is very expensive to cook from completely prepackaged foods.
Mashed potatoes seems like it would be pretty hard to stir one handed, so credit to you for that. Thinner soups or things you can boil and drain would probably be an easier choice, so you don’t have to keep hold of a pot while stirring.
Things which keep their shape and that you can fry in a large flat pan and use tongs to move about, like the spam, are probably going to be much easier and safer overall though.
If you can afford one, a mandoline that is heavy or you can fix to a surface is something that will be useful even if your arm improves, they make chopping vegetables fast - but can be risky if you’re not paying full attention. I have one similar to this, but the more industrial ones are even sturdier.
If that isn’t an option, pre-cut frozen veg are usually not hugely more expensive than fresh, and are often more nutritious than stuff on the supermarket shelves. Tinned tomatoes or sauces are easy to throw on pasta too, which doesn’t need any real stirring - just be sure to only cook smaller pots so they’re lighter to deal with. Tinned beans are also great, my go to meal is that plus tinned tomatoes, a bunch of dried herbs/spices, and whatever veg I’ve got around at the time. You can fry some meat, throw in the rest, let it heat through and you’re good to go.
If you have an oven, a whole cob of corn in-husk is 30 mins. You can throw it in there, walk away, then after 30 take it out of the oven. Just gently tug the silk out from the top, which will now come out easily with no real mess, and you can then pull down the husk to use as a handle while eating.
Don’t write off microwaves either. Washing a few potatoes and nuking them for a few minutes per potato will get you a perfectly good meal base that you can load up with whatever. Microwaves are my go to for the frozen veg to help bulk out anything else I cook too.
My speciality is not arm-based problems but I’ve had to change a lot about how I cook for medical reasons, so hopefully some of this is helpful to you too. Good luck and I hope you don’t need to adapt for long!