In a large frying pan, heat the olive oil on medium heat. Saute the chopped onion for 4-5 minutes; add jalapenos (optional) if you want a "kick". Add the ground beef. Cook until well done; drain off any fat.
Add to the meat mixture the tomato paste, water, taco seasoning, and salt and pepper (season to taste).
Place in a prepared (sprayed) large baking dish; add the cheese on top. Sprinkle with Frito chips.
Bake at 350 degrees F for 30 minutes, until hot, and cheese is bubbly.
Serve immediately with fresh ingredients: Finely chopped lettuce, tomatoes, olives, sour cream, avocados, and green onions.
Notes
Reposted from April 2017.Optional to add enchilada sauce, Rotel, or cream cheese.