Easy Enchilada Sauce

• 1/4 cup vegetable oil
• 2 tablespoons self-rising flour
• 1/4 cup New Mexico or California chili powder
• 1 (8 ounce) can tomato sauce
• 1 1/2 cups water

• 1/4 teaspoon ground cumin
• 1/4 teaspoon garlic powder
• 1/4 teaspoon onion salt
• salt to taste
•  Heat all ingredients over medium heat.