Place the bell pepper, Anaheim pepper, jalapenos, garlic, and onion in a food processor and process until finely minced. Heat the oil in a deep skillet or pot over medium heat. Add the pepper and onion mixture, the salt, black pepper, oregano, and powdered chili and cayenne (if using). Saute until the onion is soft, about 5 minutes. Add the canned green chiles and tomatoes. Reduce the heat to medium-low and simmer for 10 to 15 minutes. If desired, add more cayenne for a spicier sauce. Blend with an immersion blender until the sauce is still a bit chunky, but well combined. Simmer for 5 minutes more. Serve immediately, refrigerate in a jar, or let cool and freeze in a zip-top plastic freezer bag. The sauce will keep for 1 to 2 weeks in the refrigerator and up to 1 month in the freezer.