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Season the chicken breasts with the kosher salt and black pepper. Lay them in the bottom of a crock pot.
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Mash the can tomatoes, either with a fork or a sharp kitchen knife. Reserve all the juice. Whisk the mashed tomatoes with the chicken broth, enchilada sauce, ground cumin, chili powder and the fresh cilantro.
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Put the chopped onion, corn, roasted green chilies and the minced garlic over the chicken breasts in the crock pot. Pour the broth over the vegetables and add the bay leaf.
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Cover the pot with a lid, turn to low and cook for 6 to 8 hours. Remove the chicken before serving and shred or dice it, then return it to the pot before serving.
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While the chicken is cooking, preheat the oven to 400F.
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Cut the corn tortillas into thin strips and coat them with cooking spray. Coat a baking sheet with the cooking spray, and spread the tortilla strips over the pan.
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Bake in a hot oven for 10 to 15 minutes, stirring them once or twice. They should be crispy and not oily.
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Put some of the toasted tortilla strips into the bottom of each serving bowl. Ladle in the soup, and top with the remaining strips.