Slow cooker , air fryer and microwave are the way to go to keep the leccy down
Sounds like they have jumped onto the "Protein" bandwagon , but seem to think protein only comes from lean meats/fish and powders . They would be better off learning about nutrition properly and that a mixed and varied diet will be more filling , more protein rich then all the chicken breasts they can scoff
I have to watch the pennies, but I get plenty of protein, using tinned fish, cheaper cuts of meat, ( I eat a lot of turkey and pork compared to beef and chicken ) and I use pules and grains , cottage cheese etc . Premium cuts are usually used in stir fry/ asian dishes where the base is mostly mostly veg or pulses and the meat is a flavouring near enough
I invested in a 15 in 1 pot which is cheap to run. In it I make my own greek yoghurt, bread, cakes, stews, casseroles, ( slow cook or pressure cook ) , pasta is cooked in minutes, baked and fried good the same I can cook a roast chicken dinner. with all the veg in just over an hour
Hob cooking is a lot cheaper then oven cooking, microwave cheaper then the hob. I rarely use the oven or grill, but Im a confident cook and can cook over a candle if I need to :)