Hear the olive oil in a large pot, add the onions, and cook until translucent.
Add the green chiles, taco seasoning packet, all the canned items, and the chicken.
Bring to a boil, then allow to simmer for several minutes until heated through.
Lastly add the cream and heat for 5 - 10 more minutes.
In your slow cooker, add in chicken breasts, black beans, northern beans, rotel, stock, and taco seasoning. Cook on low 6 hours or on high 3 hours.
Remove lid and shred chicken right inside of slow cooker using 2 forks. Stir in cream corn and frozen corn kernels and keep lid off cooking another 20 minutes on high (this will let some of the liquid evaporate and give you a thicker soup). Right before you're ready to serve, stir in your half and half.
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