Chicken tortilla casserole loaded with juicy chicken, beans, tomatoes, and crispy tortillas is cozy comfort any time of year. Bake once, then let everyone customize with guacamole, sour cream, or spicy peppers for an easy weeknight dinner win.
Fry the tortillas: In a high-sided skillet, add 1 cup neutral oil over medium-high heat. In batches, add flour tortillas and fry until golden brown, about 1 minute per side. Remove from oil and allow to drain on a paper towel. Continue until all tortillas are fried.
1 cup + 2 tablespoons neutral oil
Cook the vegetables: In a large skillet, heat 2 tablespoons of neutral oil over medium heat. Add the onion, bell pepper, and salt. Sauté until the vegetables are translucent and beginning to brown, 4-6 minutes. Add the chili powder and cumin. Stir the spices into the hot oil to bloom the spices for 30 seconds.
1 medium onion, 2 large bell peppers, 1 teaspoon kosher salt, 1 tablespoon chili powder, ¾ teaspoon cumin, 1 cup + 2 tablespoons neutral oil
Add tomatoes and poach the chicken: Add the diced tomatoes and tomato sauce and stir to incorporate. Place the chicken breasts over the tomatoes and bring the mixture to a low simmer. Once at a simmer, cover and cook until the chicken breasts reach 160°F, 12-15 minutes. After the chicken has cooked, remove the breasts from the pot and set them aside to cool. Add the kidney beans to the tomatoes and stir to combine.
2 15-ounce cans fire-roasted diced tomatoes, 2 boneless, skinless chicken breasts (about 1 pound), 1 15-ounce can red kidney beans, 1 15-ounce can tomato sauce
Shred: When the chicken is cool enough to handle, shred the breasts into small pieces.
Layer the casserole: Preheat the oven to 350°F. Remove the tomatoes and beans from the heat. Grease a 9 x 13-inch baking dish and spread ½ cup of the tomato mixture over the bottom of the baking dish. Lay two tortillas over the thin layer of tomatoes. The tortillas will overlap. Add ⅓ of the tomato mixture and spread evenly. Add ⅓ of the chicken. Sprinkle with 1 cup of cheese and ⅓ of the chopped cilantro. Repeat these layers two more times, ending with the final two cups of cheese on top of the casserole.
6 flour tortillas, ½ cup chopped fresh cilantro, 4 cups shredded cheddar cheese
Bake in the preheated 350°F oven until the cheese is beginning to brown, and the casserole is bubbling throughout, 45-55 minutes. Once baked, remove from the oven and cool for 15 minutes before serving.