Heat ghee in pan over medium high heat. Add bacon and cook until crisp. Remove from pan.
Add beef and cook for about 2 minutes or until browned on all sides. Transfer beef and bacon to slow cooker bowl. Top beef with onion, garlic, jalapeños and bell pepper.
Sprinkle mixture with chili powder and cumin. Add diced tomatoes, beans and chicken stock. Stir well.
Cook on low for 8-10 hours. In the last 30 minutes of cooking time, add in pumpkin puree and stir well.