Brown the ground beef with a little salt and pepper. Set aside. Prepare tomatoes, lettuce and green onions. Combine in large bowl with the ground beef and cheese. Toss with chili powder until well combined. If you want more chili powder, go for it! Wait to add the Doritos until the salad is being served because leftover salad with soggy chips is really unappetizing. Crumble a handful of chips over the top of ech serving and enjoy!