Add the butter, onion, garlic, bell pepper, Rotel tomatoes, mushroom soup, chicken, chicken broth, taco seasoning, cumin, and chili powder to the crockpot.
Cook on high for 2 hours, or on low for 4 hours.
Add the cubed cream cheese and stir until melted and well-combined.
Serve with cheese, cilantro, and tortilla chips as desired.
