Heat a large skillet over medium-high heat. Add ground beef, cooking until browned and no longer pink. Drain excess fat if needed.
Add chopped onion and minced garlic to the skillet. Sauté for about 5 minutes until the onion becomes translucent and garlic is fragrant.
Transfer the beef mixture to your crockpot. Add potatoes, carrots, and celery, mixing to combine.
Pour in the broth. Sprinkle in thyme, parsley, paprika, salt, and pepper. Stir well to evenly distribute the seasonings.
Cover and cook on low for 6-8 hours or high for 3-4 hours, until potatoes and vegetables are tender.
About 15-20 minutes before serving, stir in heavy cream, cheddar cheese, and milk.For a thicker soup, mix cornstarch with water, then add to the crockpot, stirring until combined. Continue cooking on low until cheese melts and soup is creamy. Ladle soup into bowls, garnish with parsley and extra cheese, and serve with crusty bread.