I recently made this version as I did not have canned soups in the house. Recipe does call for 3 4.5 oz cans of chopped green chiles. I used mixed chiles I froze last year from the garden. I also added a layer of that smoked frozen corn you get from Trader Joe’s. Casserole was really good.
https://www.aspicyperspective.com/king-ranch-chicken-casserole/
I need to go to Trader Joe’s and see what it’s like. They recently opened a Lidl near me - it’s very nice. Are they similar?
I saved your recipe and made it last night. Since my husband is low-carbing, I added extra chicken, left out the tortillas, and served over spaghetti squash. This was really good! and seems very different from other King Ranch recipes I recall seeing.