In a bowl stir together olive oil, lime juice & chipotle chile powder

Place chicken between to wax sheets & use a meat pounder to pound the breast to an even thickness about 1/2 inch.

Place chicken in the marinade for 15 min to 1 hr (longer the better)

Place on high heat grill cook for 5 to 7 min each side.

Add cheese till it melts 1/2 min. Toast buns.

Assemble sandwich w/ chicken w/ melted cheese, avocado & lettuce, mayo on top of the bun