We're in a bad rut at the moment of chicken, jar of sauce, rice/pasta (work extremely busy and very very fussy teen). But favs include:
Chorizo potatoes (in ovenproof dish, tip a bag of baby potatoes (possibly halving the large ones if needed), a jar of tomato and chilli sauce, half a Lidl chorizo (sliced) and 1 pack of the Lidl double pack of bacon lardons - mix together, set oven on timer to cook for 60-75 mins until potatoes done, can put together night before as meats less problematic than eg chicken, serve dish to table and everyone help themselves)
Tacos, fajitas, quesedillas, etc - chicken, beef, fish, prawn, turkey, veggie...
Turkey, beef or veggie chilli with rice (leftovers frozen to go with baked potatoes another time)
Mac'n'cheese with lots of bacon (Lidl lardons) and veg (onion. garlic, mushrooms, peppers, petits pois, courgette etc) - leftovers can be frozen to redo as pasta bake
Large batch of Spag bol/lasagna/shepherd's pie/various types of curries etc - freeze extra portions
Risottos - Chicken, mushroom, seafood, butternut squash, spring green veg
Chicken joint traybakes, often on a bed of veggies or with roasted med veggies as a side, and often roasting baby potatoes which have had garlic granules/lemon pepper/salt/lemon juice/olive oil on them before roasting. Have been known to do a lamb chop in a similar way. Or more roots veg and long slow roasted lamb shanks (probably with baked potato rather than roast - not enough heat to get crispiness of roast).
Tagines in the oven in a regular casserole dish
Pasta carbonara