In a large bowl, whisk together the balsamic vinegar, Dijon mustard, garlic powder, onion powder, salt, pepper, and nutritional yeast.
Add the chicken to the bowl and toss to coat.
Cover the bowl and refrigerate for at least 30 minutes, or up to overnight.
When ready to grill, preheat your grill to medium heat.
Thread the chicken pieces onto the skewers, leaving about 1 inch of space between each piece.
Grill the skewers for 5-7 minutes per side, or until the chicken is cooked through.
Serve immediately.