For the sauce:
Get the grilling started since this can be a bit time consuming. Heat a grill to medium heat.
Grill the tomatoes, tomatillo, red bell pepper, poblano, serrano, and jalapeno peppers. Let cool in a resealable plastic bag or in a bowl covered with plastic wrap. The steam will also make peeling easy. Peel the tomatoes and tomatillo. Peel and seed the red bell, poblano, serrano, and jalapeno peppers. Set aside the jalapeno pepper for the enchilada filling.
For the enchiladas:
Meanwhile, preheat the oven to 400 degrees F. Line a baking sheet with foil and drizzle with olive oil.
In a small bowl, mix the smoked paprika, cumin, cayenne, salt, and pepper. Season the chicken breasts. Place on the baking sheet, reducing the oven heat to 350 degrees F and roast for 30 minutes, or until the juices run clear. Let cool slightly before shredding.
Cook the onion in cast iron pan on medium heat until caramelized, about 8 minutes, then lower to a simmer and add the garlic. Add the shredded chicken, 1 cup chicken broth, adobo sauce, and diced jalapeno. Simmer the mixture at least 30 minutes, allowing the flavors to marry.
Meanwhile, place the peeled and seeded red pepper, poblano pepper, serrano pepper, and peeled tomatoes and tomatillo in a blender. Add the chipotle pepper, garlic, chicken broth, salt and pepper and puree until smooth. Transfer the mixture to a saucepan, bring to a low boil then reduce to a simmer. Whisk in the sour cream and stir continuously until well blended. Add the chopped cilantro.
Preheat the oven to 350 degrees F. Heat the 2 tablespoons olive oil in a skillet. Lightly fry the corn tortillas to soften and crisp the edges. Place on a plate and fill with the chicken mixture and sprinkle with shredded cheese to your liking. Roll up the tortilla and place seam-side down in a 13 by 9-inch ovenproof dish. Repeat with the remaining tortillas. Top with any remaining cheese and bake 15 to 20 minutes or until the cheese starts to bubble.
Serve the enchiladas with as much sauce as desired. Buen provecho!
Fresh ingredients and fire-grilling them are a few of the secrets to my flavorful chipotle sauce. As for the chicken, to ensure moistness, I roast it 3/4 of the way through, then shred it and continue the cooking process on the stovetop on simmer with the caramelized onions, garlic, adobo sauce, and chicken stock. I also lightly fry my tortillas prior to baking to give them a nice crunch around the edges.