Put in large skillet margarine and l tbsp olive oil. Add onions and saute at medium heat until they become translucent and slightly browned. Move to side of pan add remainder of olive oil. Sprinkle spices on chicken and cook in skillet with onions. When chicken is cooked through spoon onions on top of chicken breasts, top with salsa (mild or spicy to your taste)then place slices of cheese on top. Turn heat off under pan, cover with lid and leave until cheese melts - approx 3 to 5 minutes.