Weight Watchers Cheesy Chicken Enchiladas

cooking spray, 1 spray

Velveeta reduced fat cheese product, reduced-fat processed cheese product

nonfat sour cream

fat-free evaporated milk

scallion, green part only, minced

crushed red pepper flakes

cooked chicken breasts, chopped

medium whole wheat tortillas, 7-inches each

shredded low-fat cheddar cheese, sharp variety

medium olives, black, pitted, sliced

salsa