Tray bake idea - I tend to put things in little piles so if someone doesn't like something they are not having to pick it out.
Get a tray, cover in foil and use a spray oil.
Salmon or chicken - if it has the skin on prick and add some lemon juice.
Sliced peppers, asparagus, sliced onion, carrot batons, bacon lardons, brocolli, sugar snap peas, green beans.
Add more spray and shove in the oven for 30 mins.
Frozen sausages and frozen mash - put the sausages in the oven or air fryer and mash in the microwave.
Rice with things added, I like to use smoked fish and a 50/50 orange juice and water, you can also add veg - a packet of mixed frozen veg, cashew nuts. Even better if you have a rice cooker.
Root veg bake, potatoes, sweet potatoes, parsnip, carrots, what ever is in the bottom of the fridge, toss in oil with salt and pepper and maybe a bit of chili powder.
Asian broth.
In a pan put boiling water, a cube of frozen garlic, a cube of frozen ginger, a stock cube and then anything you want, pieces of chicken or pork (good for using left overs) pak choy, noodles, again frozen mixed veg. Add soy or fish sauce, it also works well with one of those ready to cook stir fry packets from the supermarket.
I have a raclette - just prep the food and let everyone cook their own at the table.
'Picky dinner'
Selection of cooked meat, cheeses, crackers, fruit, salad, a couple of dips and some bread either pita or crusty - just put on the table and everyone helps them selves - you could get everything from the supermarket and put on the table in the packaging - then the only washing up is the plates you eat off.
I also have a steamer - buy prepped veg from the supermarket and stick in the steamer, add foil parcels containing chicken or fish with seasoning switch on for 15 - 20 mins.
I'm saying get prepped veg because the impression I get is that ease is more important than ££.
I have arthritis, some days I can cook, others I can't, others I can half cook - these are my half cook staples.