Set grill to medium high heat. Cut six 12-18" pieces of foil in rectangular shapes. Spray each with some non stick spray.
Season both sides of chicken with taco seasoning and lay in the middle of the foil.
Mix together the remaining ingredients EXCEPT cheese in a bowl and divide evenly between the 6 packets on top of the meat.
Fold the pockets; bring the long sides of the aluminum foil to meet over the chicken. Fold the ends of the foil together folding twice to create a seam. Roll up the shorter ends at least twice to create a sealed pocket/packet.
Place on to the grill and close lid for 15-20 minutes. Halfway through rotate packets so they cook evenly. Use thermometer in thickest part of meat to ensure middle is 165F or more before consuming.
Before serving sprinkle tops with cheese and close foil for 5 minutes to melt. Garnish with green onions, sour cream avocado etc..