Well you start out with a lightly olive oil greased baking dish...about 9x13. I use thighs, about 9 of them. Remove skin. Season with a little garlic powder, salt and pepper and chili powder cooked at 350 for one hour...covered tightly with foil.
Take the broth and carefully pour it into a sauce pan. Bring to a simmer.
Fill a 24 ounce cup about a 4th of the way up with flour. Then add just enough milk to make a paste. Stir till all the lumps are gone. Continue to add the milk until cup is 2/3 full and all the flour is disolved.
Slowly pour the milk and flour into the simmering broth whisping as you go to keep it from sticking to the bottom. Add more salt and pepper to taste. A little more chili powder never hurts too! Continue to stir on low heat until you reach the thickness you desire. You can always added more milk or flour to gain a different thickness.