Put something in the slow cooker that has been prepped the night before - chilli, curry, stews and casseroles
Make the WOTH day(s) the day(s) you have something you just put on a tray and put into the oven...... fish, kievs, a meat pie or quiche, pizza, with some wedges or chips from the freezer.
Jacket potatoes (microwave first then crisp up in the air fryer if you like crispy skins) with beans and cheese or tuna (or left over bolognaise or chilli from another night)
Pasta one night, with whatever you like to have it with - pesto, tomatoes, cream cheese or marmite, a jar of sauce, or create your own fairly easily, then add ham or chiritzo or bacon or leftover chicken from a roast. I'd add a load of mushrooms for me but am aware a lot of dc don't like the texture. Grate some cheese on top.
Stir fry and noodles
Poach some salmon pieces (or other fish) - very quick, but roasting them doesn't take long and doesn't need a lot of prep.
Nothing wrong with beans on toast now and then, either.