Cook the hamburger and onions in a pan over medium heat, breaking up the meat into tiny pieces and seasoning with taco seasoning.
Drain the cooked hamburger and place it in a medium basin.
Cut the avocados in half, remove the seeds, and carefully peel them from their skins.
Place half of each avocado half on a serving dish and top it with some of the shredded lettuce.
Fill each avocado half with the cooked hamburger, onion, and taco seasoning.
Spoon salsa, sour cream, and Mexican cheese blend on top of the tortillas.
Enjoy!
