I make a Tex-Mex pie that goes over incredibly well with my family and at potlucks, and it's a great use of leftover chicken. The great thing is that you can adjust the ingredients to what you have on hand and to what you like. There really is no right or wrong.
Spray a 8"-9" shallow, round baking dish or pie pan with non-stick cooking spray. Lay a pie crust in it.
In a bowl, mix:
1 cup cubed chicken
1 can black beans, rinsed and drained
1 can green chiles
1/2 cup frozen or fresh corn
1/2 cup chopped onions, frozen or fresh
1/2 cup chopped green peppers, frozen or fresh
1/2 cup skim milk
1/4 shredded cheddar cheese
2 T taco mix
hot sauce to taste
Pour mixture onto pie crust, cover with second pie crust, and seal edges. Cut 4-8 small vents in crust.
Bake at 400 for about 45 minutes. I always cover the edges with a pie shield, which you can make from strips of aluminum foil if you don't have silicone ones.
Serve with guacamole and/or sour cream on the side.