1. Preheat broiler.
2. Place chiles on a foil-lined baking sheet; broil 8 minutes or until blackened, turning after 4 minutes. Peel and chop.
3. Heat a large Dutch oven over medium-high heat. Coat pan with cooking spray. Add onion, pork, and garlic to pan; sauté minutes or until pork is browned. Add chopped chiles, chicken broth, oregano, and salt; bring to a boil. Cover, reduce heat, and simmer 1 hour or until pork is tender. Stir in hominy; cook 10 minutes or until thoroughly heated.