Tray bake?
Get one of those spray oils, put foil on a baking tray so washing up is easy. Spray the foiled tray with oil.
Pick a meat, chicken goujons work well as does salmon.
Chop up some veg, I like mushrooms, onions, asparagus, cherry tomatoes, spring onions and green beans.
Give it another spray with oil, sprinkle with seasoning of choice, I use salt and pepper and a mix called, 'spicy season oil'.
Do you have a slow cooker?
Pot roast.
Brisket works well season with salt and pepper and lightly flower, put this in the middle of the SC and pack around it, onion chunks new potatoes, slices of carrot, parsnip, leeks, swede - any fairly solid root veg, add a stock cube and a few herbs ( from a jar of dried mixed herbs) top with boiling water and leave for the day.
You could do the same with a pot in the oven or on the hob but the longer and slower the cook the better.
If you have a slow cooker then you can cook a joint or chicken in it, just put it in the sc and switch on, serve with salad. I particularly like lamb done this way, the fat melts and bastes the meat.
Picky tea, sliced melon, cooked meats, salad, couscous, pickles, crisps, crusty bread, selection of cheeses, everyone picks what they want.
Fajitas.
Prep the tray as above but put chicken goujons, sliced peppers and sliced onion on the tray, season with chili, salt, pepper. Put in the oven for 20 mins, warm a pack of tortilla in the microwave (or in the oven for the last 5 mins) serve with guacamole and soured cream (you can get both from a supermarket or you can make your own).