Spray a 9 X 13 inch baking dish with cooking spray and set aside. Preheat oven to 350 degrees.
In a small bowl, combine chicken and 1 cup of Monterey Jack cheese. Fill tortillas with this mixture and roll each one up then place seam side down in prepared pan.
Melt the butter in a skillet. Sprinkle flour over melted butter and whisk to combine. Cook for 1 minute to remove the flour taste. Remove the skillet from heat and whisk in broth. Place back on heat and cook until the mixture has thickened and is bubbly.
Cool sauce for 3-5 minutes. (Don’t skip this step- if the sauce is too hot and you add the sour cream it will curdle it-yuck!) Add sour cream and chilies and stir until sauce is smooth and sour cream is completely dissolved.
Pour sauce over enchiladas and add remaining cheese over top. Bake in preheated oven for 20-25 minutes or until enchiladas are heated through and sauce is bubbly. Turn on the broiler and broil until top is nicely golden. Top with chopped green onions and serve.
Mothers Secret Recipes of Comfort Food & Culinary Inspiration from an Organic and Allergen-free Approach