Taco salad is great, because you don't always have to use the same ingredients every time. If you are preparing a meal for several people (roommates), place each mix-in into separate bowls. Then people can make their own salads.
Brown some ground beef, or use ground turkey, or even chicken instead. Season it with salt and pepper, or a taco seasoning packet.
Chop up some lettuce.
Crush up chips in your hands, and place in the bottom of your bowl... I use tortilla chips, but corn chips, or Doritos work too.
Then add some beans... I use pinto beans, but there are also kidney beans, chili beans... whatever you might have on hand.
Suggestions of mix-ins:
Top it off with sour cream, and/or a favorite salad dressing.