Well, chicken stir fry is easy because you can basically chuck anything in and it tastes great (i use up all the soggy veggies from my fridge) Get yourself a cheap wok, heat it hot with oil and chuck in chicken pieces, let them brown and then add any veg you like - mushrooms, broccolli, mini corn on cob, sugar snaps (like mini mange tout but nicer). Add a splash of soy sauce or sesame oil. Then add some noodles ( i buy amoy straight to wok noodles).
You can really experiment with this, you could try chicken, sesame seeds and oil. Or lemon chicken with juice of a lemon, some lemon peel and a mix of cornflour and water.
Lasagne is another goodie. Brown some mince in a pan, chuck in any veggies, and a jar of tomato based sauce (like the pasta sauces). In another saucepan heat a large blob of butter (i'm sorry i never weigh anything so have no idea with weights), say two tblsps butter, then stir in 2tblsp plain flour, keep stirring all time, slowly pour in milk, keep stirring and bring to boil then let simmer for a while for the sauce to thicken. (mine always go lumpy, but keep stirring and they eventually dissove.)
Now in a casserole dish put half the meat mixture. Then lay on top some lasagne pasta sheets, then pour on half the white sauce you made. Repeat. Top with grated cheese and cook in oven for 40 mins.
The good thing about dishes like lasagne, is you could cook them much earlier in the day and then just reheat them for dinnertime.
Casseroles are another easy dish, which again you can chuck anything you like in and experiment.
Happy cooking!