Pasta and cream cheese.
Put the pasta on to boil, when it is ready turn of the heat but don't drain yet.
Put the cream cheese in a pan, about 2 desert spoons per person and stir with a wooden spoon, add a couple of spoons of the pasta cooking water and in about 2 mins you have a creamy sauce for your pasta.
Drain the pasta and add it to the sauce before serving.
You can then add to this eg by frying mushrooms before putting the cheese in the pan. Or bacon, mushrooms, spring onions, onion etc you get the idea.
I'd agree with getting a slow cooker, for a roast just put the meat in the sc and leave, do the veg when you are ready to eat.
I have an electric steamer as well so I can put the meat on first thing, prepthe veg and leave them in the steamer, 10-15 mins before I want to serve I just turn the streamer on.
Another easy sc recipe - some meat (pork ribs or chicken pieces), put it i the sc, put the kettle on, add some tinned kidney beans, some sliced chorizo and a packet/jar of passata. If needed top up with boiling water and leave to cook.
Have you got a rice cooker? Argos do a cheap one and often they have offers on buying appliances together.
OK assuming you have a rice cooker, put in the rice for how ever many you are serving, shake and open a tin of coconut milk, add it to the rice. Then add frozen or tinned sweet corn, kidney beans, peas, whatever you like.
Either eat the rice as a vegi dish or you can add a fillet of fish, just put it on top of the rice, I tend to do this with salmon.