Marinate the chicken: Add all of the chicken marinade ingredients to a medium bowl and whisk together to combine. Add all of the frozen, knife sliced chicken breast pieces to the marinade, toss to fully coat and let sit for 15-30 minutes or until the chicken has thawed.
Thread the marinated chicken onto the skewers, dividing evenly between the skewers.
Heat the grill to medium-high heat, about 400F.
Oil the grill well and when heated, place the skewers on the grill and cook, turning occasionally, for about 10-12 minutes or until cooked through (internal temperature reached 165F) and well browned.
Remove from the grill and let rest for 5 minutes.
While the chicken rests, melt the butter with the 6 cloves pressed garlic for the garlic parmesan sauce in a saucepan on the oven. Once melted, remove from the heat and pour into a bowl.
Whisk the minced parsley and freshly grated parmesan cheese into the bowl of melted butter and set aside a bit of the butter mixture for dipping. Immediately brush all the skewers with the remaining garlic parmesan butter and then serve.