To use your crockery cooker:
In a 3-1/2- to 4-quart electric crockery cooker, combine all ingredients, except sour cream, cheese, and chips. Cover; cook on high-heat setting for 3 to 4 hours or on low-heat setting for 6 to 8 hours. Stir 1 cup of hot mixture into the sour cream. Return to cooker. Let stand, covered, for 5 minutes. Sprinkle each serving with cheddar cheese and serve with chips.