Brown beef with onion in a large skillet over medium-high about 8 minutes until fully cooked; drain excess fat.
Transfer to slow cooker; add potatoes and garlic.
Pour in broth; stir in soup, garlic powder, onion powder, paprika, salt, and pepper.
Cover; cook on low 5 hours or high 2.5 hours until potatoes are fork-tender.
About 30 minutes before serving, cube cream cheese and stir in with 1 cup cheddar and half the bacon until cheese melts and chili is creamy.
Serve hot in bowls topped with sour cream, green onions, remaining cheese, and bacon.