Preheat the oven to 350°F with a rack fitted in the center of the oven
In a large oven-proof skillet, set over medium heat, heat the olive oil until glistening
Add in the onions and cook until translucent, about 5 minutes.Add chicken, taco seasoning, green chilies and enchilada sauce to the skillet, stir to combine
Add the tortilla strips
Bring the mixture to a boil over high heat, then reduce and allow to simmer until the tortilla strips are softened, about 2 minutes
Try to separate the tortilla strips as best as possible
Turn off the heat
Top with cheese and bake on the center rack until the cheese is melted and the sauce is bubbling, about 25 minutes.Top with cilantro and sour cream if desired
