To make homemade enchilada sauce: In a medium saucepan or skillet, heat olive oil over medium high heat. Add in onions and cook, stirring frequently until they become translucent, about 5 mins. Add in garlic, chili powder, cumin, salt and oregano and cook for 30 more seconds. Add in tomato sauce and water; stir well to combine. Reduce heat to medium-low and simmer sauce for 10 minutes.
The nutrition for this recipe is based on 6 servings for a meal.