4 skinless, boneless chicken breasts (about 8 ounces each)
2 tablespoons vegetable oil
1 teaspoon Cajun seasoning
Kosher salt and freshly ground pepper
1 3-ounce link andouille sausage, thinly sliced on an angle
1/2 small green bell pepper, thinly sliced
1/4 small onion, thinly sliced
Chopped fresh parsley, for topping