Heat butter in a skillet. Season chicken liberally with southwestern seasoning. Cook chicken in pan, turning over once, until no longer pink in the center, about 10 minutes, depending on the size of your breasts. Remove chicken from pan. Allow to cool about 10 minutes.
Return pan to, add corn to pan and cook 1-2 minutes, just to give it a little yummy flavor.
Dice chicken into cubes, or strips.
Arrange the ingredients on a platter w/ chicken in the middle. Put lettuce in separate bowl allowing your diners to add only what they enjoy.
Serve with your favorite dressing. Ranch goes deliciously with it.
Alternate presentation: Pile everything onto chopped lettuce and mix together and serve as one big bowl of salad.