Spray the crockpot with nonstick cooking spray. In a large skillet, brown the ground beef with chopped onion and garlic. Drain the fat and season with taco seasoning. Transfer the seasoned beef mixture to the greased crockpot.
Add the frozen diced potatoes over the beef. Sprinkle another taco packet over the potatoes. Add the drained Rotel and cream of chicken soup. Sprinkle shredded cheese on top. Stir everything together. Cover and cook on LOW for 3 hours.
Give everything a big stir and add more shredded cheese Cover it again, and cook for 10 more minutes or until melted and creamy. Serve and enjoy!