Preheat the oven to 350℉
Melt butter in a stock pot over medium heat. Add the onion and saute for 5 minutes or until softened.
Add garlic and cook for a few more minutes. Add flour and stir well cooking for 1 minute more.
Add the cream of chicken soup and milk, stir in until well blended.
Add a packet of taco mix, salt and pepper and cooked chicken, stir in until well blended again.
Lastly stir in hot pimento cheese until melted in well.
In a large frying pan, add few tbsp of oil to heat up.
Add tortillas to cook for a few minutes on each side to crisp up slightly. Continue until all tortillas are done.
In a casserole dish, layer few tbsp of the chicken mixture on the bottom.
Add tortilla shells to cover the bottom.
Layer ½ of beans, ½ of corn, ½ of salsa and ½ of the chicken mixture.
Continue with another layer of shells, beans, corn, salsa, and lastly the chicken mixture.
Mix crushed tortilla chips and Colby jack cheese then sprinkle on top.
Bake for 20 minutes.