Bring first 3 ingredients and 3 cups water to a boil in a 3-qt. saucepan; boil 10 minutes.

Meanwhile, sauté onion and peppers in hot oil in a large Dutch oven over medium-high heat 4 minutes or until tender. Add corn; sauté 2 minutes. Add chili powder and cumin; sauté 4 minutes.

Remove tomatillo mixture from heat, and cool 5 minutes. Process mixture in a blender until smooth.

Add chicken, beans, and tomatillo mixture to Dutch oven. Cook, stirring occasionally, 15 minutes. Stir in tortilla chips and next 4 ingredients; cook 5 minutes or until tortilla chips are soft. Serve with desired toppings.