Tray bakes - veg + protein
Curried veg, Med veg, etc - v low effort
You can also do a tray bake stir fry
Sausages n mash (either frozen mash or from baked potatoes made extra earlier in the week)
Fish pie - lots of quick gratin versions
Garden pie - cottage pie w lentils
Mezze - hot spicey lamb sausges, couscous, flatbread, hummus, falafel and salad
Stews - oven or slow cooker - beef and ale, sausages and beans, lamb hotpot, Spanish - chicken and chorizo and peppers or pork and peppers, chicken paprika, pork and lentils etc
Quiche (there is an Australian version where rather than making a crust you just chuck the flour in the mix and it sinks to the bottom
Greek pie - spinach and feta in ready made puff pastry, or baked Camembert in puff
Spanish omelette
Cheese gratin - whatever veg you need to use up, in a cheese sauce with a gratin on top, you can add a bit of ham or whatever if you want.
Pasta carbonara, mushrooms/broccoli/ham, sausage and mushroom, salmon and creme fraiche, pea n pesto
Risotto - chicken, mushroom (there are cheat versions you can do in the oven)
Fish parcels - trout etc w veg and baby potatoes
Grilled mackerel w roasted veg