Comforting Beef and Yam Chili (Crockpot)

1 lb. ground sirloin
4 c. cubed unpeeled yams
2 ½ c. beef stock
2 c. chopped onion
1 c. chopped red bell pepper
¼ c. tomato paste
2 T. chili powder
Kosher salt, red pepper
2 t. ground cumin
4 T. minced garlic
2 (14.5-oz.) cans diced tomatoes, undrained
1 (15-oz.) can black beans, rinsed and drained
1 c. chopped fresh cilantro or parsley, divided
1 c. shredded sharp cheddar cheese

1. Heat a large nonstick skillet over medium heat.
2. Add beef and cook stirring often to make it crumble and mostly browned, 3-5 minutes. Beef does not have to be fully cooked. Remove from heat.
3. Combine yams, stock, onion, bell pepper, tomato paste, chili powder, salt, red pepper, cumin, garlic, tomatoes and beans in a 6 quart crock pot (slow cooker).
4. Stir in beef.
5. Cover and cook on LOW for 7 hours.
6. Stir in half cilantro.
7. Ladle into bowls and top with cheese and remaining cilantro.