Sprinkle chicken with salt and pepper.
Brown chicken in a lightly greased nonstick skillet over medium-high heat 4 minutes on each side; remove from skillet.
Add limeade concentrate, brown sugar, and ketchup to skillet; bring to a boil. Cook, stirring constantly, 5 minutes or until thickened. Return chicken to skillet; cover and cook for 10 minutes or until done.