Crockpot Chicken Taco Chili

onion, (chopped)

: 16 oz can black beans, (drained)

: 16 oz can red kidney beans, (drained)

: 16 oz can tomato sauce

package frozen corn kernels

: 14.5 oz cans of diced tomatoes w/green chilies

packet taco seasoning

ground cumin

chili powder

boneless (skinless chicken breasts)