Slow Cooker Black Bean Chili

1 lb ground beef
1 medium onion, chopped
16 oz jar thick salsa
15 oz can black beans, rinsed and drained
1/2 cup chicken broth
1 medium red bell pepper, chopped
1 tsp ground cumin
2-3 tsp chili powder
1 to 1.5 tsp dried oregano

1. Brown ground beef and onion in skillet. Drain.
2. Combine all ingredients in slow cooker.
3. Cover. Cook on low 8-10 hours or high 3-6 hours.
4. When serving, add sour cream and guacamole if desired.