Preheat oven to 350 degrees F. and lightly spray an 8x8 inch baking dish with cooking spray. Place soft taco shells into dish, standing up, ready to be filled.
Place chicken into a medium mixing bowl and stir in enchilada sauce and green chilies. Stir to combine. Spoon chicken filling into soft taco shells and top with shredded cheese. Bake for 15-20 minutes or until hot and melted. Remove and serve warm.