In a large saucepan, over medium heat, heat the oil. Add the onion and saute until it begins to soften, about 2 minutes. Sprinkle with garlic powder as it cooks. Add the beans, corn, broth, green chile, cream cheese, salt, cumin, oregano, pepper, and cayenne. Bring to a boil. Add 3 cups of COOKED chicken cut into ½" pieces