First prepare the enchilada sauce. In a medium sauce pot combine the vegetable oil, flour, and chili powder. Heat the mixture over a medium flame until it begins to bubble. Whisk and cook the bubbling paste for 1-2 minutes. Slowly pour in the water while whisking. Add the tomato paste, cumin, garlic powder, cayenne pepper, cocoa powder, and salt. Whisk until smooth and continue to heat over a medium flame. Let the sauce come up to a gentle simmer, at which point the sauce will thicken. Once thickened, turn off the heat and set the sauce aside.