I agree with stir fry too.
Also Salad with jacket potato, some cold meats on the side and some scotch eggs (which you can easily home make.. just boil some eggs, cover the eggs in milk, get some richmond sausages and peel off the skin, rap the sausage around the egg, put some bread crums on it and then put in the deep fryer for like 10 minutes or so.. and voila!)
Get a big baguette from a supermarket (usually pretty reasonably priced), cut open the baguette, pour a whole tin of spaghetti into the baguette, top with grated cheese and put under the grill until it looks tasty! lol.
Pasta mixed with either the tinned sauces you can buy (sometimes quite expensive though unless you go to cheap supermarkets like lidl) or mix up your own sauce with tomato puree and herbs.
Typical fry up... chips (could be oven chips... even easier than frying! lol), bacon, eggs, sausages and fryed bread with some mushrooms and beans. Easy!
Cereal for breakfast... cheap and easy, 1 minute job! lol.
Beans and cheese on toast.
Mashed potato, vegetables and sausages or something vegetarian if you're a vegetarian (like vegetarian burger).
Curry... just get some mince and curry powder or sauce, and cook some rice (you can even get boil in the bag rice, which is easier than normal rice to cook).
Chicken and potato.
Pot noodle lol. Pizza. (These 2 are last resorts lol, as they aren't particularly healthy!)