Step #2 Roast chiles under broiler on cookie sheet until skin is brown & charred on all sides.
Step #3 Cool until you are able to touch peppers, then peel off skin.
Step #4 Make a slit down one side of the pepper, & remove stem & seeds.
Step #5 Reduce oven temperature to 350 degrees F (175 degrees C).
Step #6 Line the bottom of an 11 inch square baking dish with chiles.
Step #7 Layer Monterey Jack cheese & Cheddar cheese evenly over chilies.
Step #8 Spread cooked chicken over cheese.
Step #9 In a medium bowl, using a wire whisk, mix flour with a small amount of evaporated milk until it forms a smooth paste, then whisk in remaining milk & sour cream.
Step #10 Beat in eggs, one at a time.
Step #11 Pour evenly over chicken.
Step #12 Bake in preheated oven for 40 mins, or until center of pie becomes firm.
Step #13 Spread salsa over top, & bake for 15 mins.