2 boneless, skinless chicken breasts, butterflied into halves (4 halves total)
2 tbsp. vegetable oil, divided
1 shallot, minced
2 cloves garlic, minced
1-2 tbsp. minced chipotle peppers in adobo sauce
1¾ cups chicken broth
5 cups tortilla chips, broken into large pieces
2 tomatoes, seeded and diced
4 oz. sharp cheddar cheese, shredded
2 tbsp. chopped fresh cilantro
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Pat the chicken breast halves dry and season with salt and pepper. Heat 1 tablespoon of the vegetable oil in a 10-12 inch oven-safe skillet over medium-high heat. Add the chicken to the pan and cook until golden brown on both sides (chicken does not need to be fully cooked at this point.) Transfer to a plate and set aside.
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Add the remaining oil, shallot, garlic, chipotle, and ¼ teaspoon of salt. Cook just until fragrant, about 30 seconds. Add the chicken broth, scrape the browned bits from the bottom of the pan, and bring to a simmer.
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Stir in half of the tortilla chips. Nestle the chicken into the broth and cook over medium-low heat until cooked through (reading 160° F on an instant-read thermometer), about 10 minutes. Transfer the cooked chicken pieces to a cutting board and shred into bite-sized pieces when it is cool enough to handle.
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Return the shredded chicken to the skillet with the tomatoes, ½ cup of the shredded cheddar cheese, and 1 tablespoon of the cilantro. Stir in the other half of the tortilla chips until they are incorporated and moistened.
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Sprinkle the remaining cheese on top and place the pan under the broiler until the cheese is melted and browning, about 2-3 minutes. Top with remaining cilantro and serve, allowing the casserole to cool 5 minutes before serving.