I like to do what I call meal adaptations so for example make a huge pot of your spag Bol, adding beans and seasoning for chilli, adding a soft cheese for a cheesy pasta bake, lasagne or an Italian pie - do some garlic and cheesy mash for on top.
Chicken (any cut you like) with different seasonings - BBQ, Garlic and Herb, Tikka, Peri. The maggi bags are good for this. Also can stuff these with cheese, wrap with bacon and top with different sauces ie peppercorn, BBQ, pesto. Freeze pesto into servings to always have on hand.
Sausages done either fried with sides like mash, hot dogs, sausage hot pot, corn dogs, or even do a breakfast for dinner fry-up.
Different pasta bakes to use up left over meats from above. A fabulous carbonara can be made from fried pancetta/bacon, egg yolks and Parmesan with some garlic.
Vegetable bakes with some cheese sauce, left over veg can be blitzed together coated in flour and become fritters. Mashed potato can become potato scones etc.
Stir fry, egg fried rice also go great.
Instead of doing a set meal plan, I would do a set protein plan and just use seasonings/techniques to change it up, found this saves a lot of waste too as we weren’t buying specific items for specific meals🤗