White Chicken Chili

1 lb. cooked chicken

1 med. onion, chopped fine
½ tsp. garlic powder
1 tlb. oil
2 cans northern beans
1 can chicken broth
1 can Cream of Chicken soup
1 can chopped green chilies
1 can Mexicorn
1 tsp. salt
1 tsp. ground cumin
1 tsp. Oregano
½ tsp. pepper
½ cup evaporated milk

Combine and let cook until desired temperature.  Serve with cheese, sour cream, and tortilla chips.