Brown the ground beef in a skillet over medium-high heat until no longer pink; drain excess fat.
Transfer the cooked beef to the slow cooker insert.
Add the onion, garlic, pumpkin puree, black beans, kidney beans, diced tomatoes, broth, chili powder, cumin, salt, and pepper.
Stir the mixture thoroughly to combine all ingredients.
Cover and cook on low setting for 6 hours or high setting for 3 hours.
Thirty minutes before serving, add the cubed cream cheese and stir until completely melted and the sauce is creamy.
Adjust seasoning to taste and serve.