In a skillet, cook ground beef, onion, and garlic over medium-high heat until thoroughly cooked; drain.
Spray slow cooker with nonstick cooking spray.
Place cooked meat mixture in slow cooker. Add taco seasoning, cheddar cheese soup, tomatoes, milk, and 1 cup shredded cheese. Stir together and cook on low for 3-4 hours. (This soup can also be kept on a warm setting for an additional 4 hours).
Stir before serving.
Top individual servings with crushed tortilla chips, shredded cheese, and sour cream.
Notes
You can also make this just on your stove top. Brown the beef, onion, and garlic over medium-high heat until thoroughly cooked. Then in a large pot, add all ingredients and heat over medium-high heat for about 20 minutes, stirring occasionally. Stir well before serving.Adapted from Pillsbury.