Heat large nonstick skillet over medium heat until hot. Add ground beef; cook 12 to 15 minutes, breaking into 1/2-inch crumbles and stirring occasionally.
Transfer beef into 4-1/2 to 5-1/2-quart slow cooker; add all other ingredients.
Cover and cook on HIGH 2 hours or LOW 4 hours until flavors are blended.
Garnish soup with tortillas pieces, cheese, avocado, sour cream and taco seasoning, chopped onions as desired.
Do not put sliced tortillas into soup while cooking.
Before serving, put some sliced tortillas in the bottom of the serving bowl, then add the soup. This will heat the tortillas without turning them to mush.
I use 3 lbs of ground beef and then double all ingredients to make a larger pot of soup serving more people. -Dad
0 servings