Spray 9x13 baking dish and set aside
Preheat oven to 350 degrees
Add the Rotel and 1 1/2 cups cheese to the cooked and shredded chicken, stir well
Meanwhile, melt butter in a large pan on medium heat
Once butter is melted, add flour, stir well to combine
Turn heat to medium-high and slowly add the chicken broth to the mixture
Once the butter, flour, broth mixture has thickened, turn down heat and add sour cream and green chilies
Turn off heat and let sit a bit to thicken while stirring frequently
Place 1/2-2/3 cup chicken mixture inside each tortilla, rolling one by one and setting seam side down in baking dish
Once all the enchiladas are rolled, pour homemade white enchilada sauce over entire pan of enchiladas, top with remaining cheese
Bake for 20-25 minutes at 350 uncovered