Begin by seasoning the chicken breasts with fajita seasoning, salt, and pepper. In a large skillet, heat the olive oil over medium heat. Once hot, add the seasoned chicken breasts and cook for about 6-7 minutes on each side, or until the internal temperature reaches 165°F. Remove the chicken from the skillet and let it cool slightly.
Once the chicken is cool enough to handle, shred it using two forks or your hands. Place the shredded chicken in a mixing bowl.
To the shredded chicken, add the softened cream cheese, queso cheese sauce, cumin, and salt. Mix until well combined. Fold in 8 ounces of the shredded Mexican cheese blend, reserving the remaining cheese for topping.
Preheat your oven to 350°F (175°C). Take a tortilla and spoon about 1/4 cup of the chicken mixture into the center. Roll the tortilla tightly around the filling and place it seam-side down in a greased casserole dish. Repeat this process with the remaining tortillas and filling.
Once all the enchiladas are in the dish, pour the mild salsa verde evenly over the top. Sprinkle the remaining cheese blend over the enchiladas.
Cover the casserole dish with aluminum foil and bake in the preheated oven for 20 minutes. After 20 minutes, remove the foil and bake for an additional 10-15 minutes, or until the cheese is bubbly and slightly golden.
Remove the enchiladas from the oven and let them sit for about 5 minutes before serving. Drizzle with sour cream and garnish with fresh cilantro if desired. Enjoy your Amazing Chicken Enchiladas with your favorite sides!