Combine chipotle peppers, seasoning sauce, oregano, cumin, garlic powder and pepper in small bowl; set aside.
Heat oil in a large, heavy-bottomed soup or stock pot over medium-high heat. Add onion; cook, stirring frequently, until tender. Stir in water, chicken, hominy and bouillon. Stir in chipotle mixture; bring to a boil. Reduce heat to medium-low; cook, stirring occasionally, for 30 to 40 minutes or until hominy is soft.