Layer taco chips in a baking dish and top with:
ground beef with taco seasoning (you could also do spiced chicken)
chopped tomatoes and onions
black beans or refried beans (sometimes I use both)
sliced jalapeno peppers
a little enchilada sauce (I make mine, but you can buy it also). Could also use salsa.
cheese (I use a combo of cheddar and Monterey jack)
and anything else you feel like throwing on there. Heat in 350 degree oven for maybe 15 minutes. Serve with sour cream, guacamole, salsa, or whatever you like. Great appetizer too.