I have been making this dish since my two boys were little. It's a surefire way to get your little ones to eat salad. My boys are now grown and still ask me to make this for them. You will love it too!
Brown the ground beef until cooked. Add the taco seasoning with 3/4 cup of water (or less if you prefer). While the ground beef is cooking, prepare the tater tots and cook according to directions.
Place the tater tots on bottom of dish (or tostada bowl), next layer with the beef. Add the salad and top with cheese, salsa, tomatoes, green onions and sour cream. I add all the above ingredients to mine, however it is up to and what you prefer.