Ohh thats easy....
Lets start with the american classic (the hamburger).
Get some 80% lean ground beef and pre-form it into small thin patties (8oz of meat per patty is all you really need.) Wrap the meat in plastic wrap and put in a freezer bag. Freeze the patties. (this is a trick the fast food places use to keep their burgers from shrinking a lot) and pull out one or two when you need to eat. Now a burger by itself isn't that bad for you, (especially a grilled one) but when you tack on cheese, mayo, fries and a Coke your talking about loads of extra calories. Cut them out and make a nice salad with some dark hearty greens like spinch leaves and romaine (pre-bagged salads are good and easier for one person to use up) also add some red onion, some fresh tomato, a few mushrooms some bell or red peppers and a root vegtable like grated carrot or parsnip and skip the cheese. Make a light vinegrette with some balsamic vineger and olive oil. Toss the in the dressing and serve on the side of your plate. Hey and top the burger well. Remember if you have to have cheese or mayo that they are high in fat. Kraft makes a nice lite single and I think they have light mayo if you like that kind of thing.
You may feel at first that a salad and a burger are not enough to fill you up. But they are, all you have to do is eat more slowly. Normally when gamers eat they wolf down their food. This prevents your body from accurately gauging how full you are and can lead to over eating. Enjoy your food, chew it, savor it and eat slowly. You'll feel better and eat less.
By cutting out the cheese, keeping mayo away and using small portions of lean meat you can make yourself a burger with less fat than Mcdonalds or Burger King.
For steak remember that your slice of meat shouldn't be larger than 8 oz especially if its good meat.
Chicken is a whole other story so I'll tackle it tomorrow.
