Heat the oil in a medium saucepan over medium heat. Add the onion and sauté until softened, about 5 minutes. Add the garlic and the spices and sauté for 30 seconds.

Add the tomato sauce and water, and stir well to combine.

Bring the sauce to a boil, then remove from heat. There is no need to cook the sauce any further as it will continue cooking with your enchiladas. If you'd like a smoother sauce, process in a food processor until smooth.