To ban cooking for teenage boys

Well aren't you perceptive! She's literally told us they cook protein based snacks 🙄

So don't have the food they cook in the house then? Then if they want to cook it they will have to go out and buy it themselves (which might put them off in terms of time and money.

Have you identified why they prefer hot food over your alternatives? That might help you come up with a better plan of option.

Who said they weren't cleaning up at the time or in the exact way the OP would like? She says, 'They didn’t clean up and when I told them they had to my 19 year old just ordered a huge amount of foil roasting trays , takeaway type tubs and paper plates and bowls'.
Why is it only the army or prison in which capable adults or near adults should clean up if asked to?
The OP has tried to talk to them. They tell her she's 'complaining', do silly things like buying unnecessary disposable stuff, or simply choose to ignore what she's asked.
Incidentally, my DP doesn't eat food that he knows is my favourite, or not without asking first or replacing it. Maybe your standards are a bit low?

Why does it have to be junk just because it’s not cooked ?

The point of me saying the OP pays for the majority of things is that therefore she gets to set some rules and standards and to expect the others to respect them.

Having raised three sons, it’s perfectly obvious that some of the posters here haven’t got a clue how much food teenage boys can need. It’s not about “toxic masculinity” it’s not about being disobedient. It’s about being hungry.
Would you like them to dictate to you when you are hungry or not? Or what you should eat? Or how much you should or shouldn’t eat? Unless they are all overweight just let them get on with it, and accept the fact that teenage boys will eat a lot. And hot food is more satisfying than cold. So sorry, no sympathy from me. More stop being so controlling.

She's annoyed at the fact that they cook so much rather than sometimes eating cold food and saving the energy bills.

Sounds like they are cooking protein based snacks. Are they very sporty?

The issue won’t be them cooking in their own home - although personally I wouldn’t have a partner that ate vast amounts of sausages and bacon, because it would likely make them prematurely ill/dead, or who was an environmental savage with disposable cookware.

The issue will be having absolutely no respect for the women in their lives, no boundaries, no willingness to compromise.

I never said she shouldn't set rules ot standards. I am a firm believer in boundaries.
My point was in response to people saying that she pays for the majority of things.

Last night I was making chicken stir fry. Ds 17 said it wouldn’t be enough protein (I was cooking 6 chicken breasts) he insisted on also getting prawns from the freezer and adding those too. We had tons of noodles and veg too and homemade lemon cheesecake for dessert. An hour later it had to be a huge bowl of pasta with tons of cheese then at midnight baking.

So your children are cooking healthy meals and you want them to eat junk?

Yes, so it's perfectly reasonable for her to set some rules and standards. Self-evidently ones like 'don't eat food that I've already asked you not to take' and 'clean up after yourself'.

What happens if you eat cold food in February?

But she’s also annoyed when they make pasta, or protein oats, or brownies.
She has an issue with them eating literally anything except what she chooses to consume for herself.

Last night I was making chicken stir fry. Ds 17 said it wouldn’t be enough protein (I was cooking 6 chicken breasts) he insisted on also getting prawns from the freezer and adding those too. We had tons of noodles and veg too and homemade lemon cheesecake for dessert. An hour later it had to be a huge bowl of pasta with tons of cheese then at midnight baking.

What issue will a future partner have with one of these men buying their own food, cooking it themselves and ensuring the cookware is clean?

If a partner had a problem with their OH cooking food in their own home they would be called controlling and abusive.

If course she pays for the majority of things. She is their mother and two of them are minors.

Some of these replies are odd. You've communicated house rules and your sons are ignoring you, overriding you, and making up their own inappropriate solutions rather than proposing changes or explaining why they can't follow the rules. You're irritated by the unnecessary cost, the waste of finite resources, the inconvenience of their routinely finishing an item and not replacing it/communicating that it needs to be replaced, having people underfoot when you're cooking dinner for everyone, etc. But the root issue is that right now, everyone's doing whatever the fuck he wants rather than compromising a little for the good of a functional, happy household.

I grew up in a vegetarian household. My parents didn't prevent us from eating meat, but they had rules about no meat in the refrigerator and no cooking meat in the house. My brothers and I didn't violate them any more than we would have chain smoked in a smoke-free house or adopted a dog and brought him home to a pet-free house. (And I'm fairly sure, by the way, that we not have been allowed to buy a bunch of disposable trays and utensils and leave them in the family kitchen - that's horrifically environmentally unsound and you have every right to say no to it.)

But if your sons have reached the age of 15+ with no effective consequences for breaking the rules, they're going to be difficult to enforce now. I'd probably try ONE more time to explain what the problem is now and give them a chance to participate in fixing it. Have a family meeting when everyone's free and not rushing off somewhere. If there's another adult in the house, make sure they are in agreement and will back you up. Let everyone speak, explain what the issues are and what you would like to change, listen to any objections, try to come to a compromise. You can include things like whoever finishes an item replaces it, or puts it on the shopping list. If you cook dinner every night from 6 to 7, no one uses the kitchen during that time. Stove gets used for no more than an hour each evening (or specific evenings each week) - if they can't coordinate, make a roster. These are just examples; you get the idea. Once you have a workable set of rules, make sure everyone understands and acknowledges what's been agreed. Put up a list on the wall if necessary. Be clear on the consequences of breaking them - if a rule isn't working, it's discussed again so it can be changed if needed, not just ignored.

A side note - if you've cut the pocket money for your younger sons and they're not working, they're getting money from somewhere to buy sausages and bacon (and pot). I suspect some of it is from the 19yo but could it also be from their dad, or another relative, a "job" you don't know about? It may take some work to figure out effective consequences. Pocket money completely suspended for rule-breakers is an option, but money won't work if they're getting it elsewhere.

I don't know why you put nut butters in sneer quotes. And as the OP says, you can buy it cheaply at Lidl.
How much exactly should she compromise? She pays for the majority of the things they have, not least the roof over their heads.
Disposable cookware isn't particularly sustainable as a solution, and if the OP doesn't like it, again, she pays and she runs the house, so she's well within her rights to say so. They are fully capable of cleaning up.
And it's not about not approving of their preferences, not in the way you make it sound – she is worried about the amount of processed meat they eat. Look at the recent and current science on this issue, and/or at any number of threads on here about it and you will see that it is widely considered to be problematic, and people saying they've cut out or cut down on it; she's hardly an outlier.

What happens if you eat cold food in February?