In a medium saute pan, heat the butter. Add the garlic and onion until clear. Add spinach, basil, salt,pepper, cayenne and chicken.
Turn off heat and add sour cream and cheese and mix.
I steam the tortillas before I fill them to soften the so they don't tear. Fill the tortillas, roll and place in casserole pan that you've put a little of the sauce in. Then pour remaining sauce over tortillas and some more cheddar cheese if you want. Bake at 350° for about 20-30 minutes. Makes about 8-10 enchilads.