Heat a saucepan over medium heat, add the oil and garlic; sauté until golden, about 1 minute. Add the chicken broth, tomato sauce, chipotle chiles, hot chili powder, cumin and salt and pepper, to taste. Bring to a boil then reduce the heat to low and simmer, uncovered for 7-10 minutes. Set aside until ready to use. Makes 4 cups.