Mix all ingredients except potatoes and beef broth, spray crock pot. Season with season salt, onion powder, paprika, garlic salt. Or whatever seasoning you like. Pour ingredients into crock pot. Put mash potatoes on top. Or, if using raw potatoes, put raw potatoes on bottom and pour ingredients on top.
Cook on high for 1 hour or low for 2 hours. Add beef broth for proper consistency. Cook and additional 3 hours on high or 4 hours on low.