This is an original recipe by Mike McNalley. Please acknowledge www.mcnalley.com if you choose to publish this recipe elsewhere.
Heat oil in a saucepan over medium heat. Stir in chili powder, garlic and flour. Simmer while stirring constantly for a few minutes to cook the flour a bit. It's important to stir constantly at this point to keep the flour from burning.

Stir in remaining ingredients and simmer for about 10 minutes. Sauce should thicken slightly. I add hot water until the sauce is the consistency I like.