In a bowl or marinade bag, combine marinade ingredients. Add the veggies, already sliced, into the bowl or bag, and toss to coat with the marinade. Cover with plastic wrap or seal the bag.
Marinate
Marinate the veggies in the fridge for 30 minutes up to 4 hours.
Assemble & Grill
If using wooden skewers, soak them in water for 30 minutes to prevent them from burning. Thread the veggies through the skewer.
Heat the grill to medium-high heat (375F to 400F). Once hot, brush oil on the metal grates. Place the kabobs on the grill with the lid open. Cook for about 5 minutes on the first side; use tongs to flip them over, and then cook for an additional 4 minutes with the lid closed. Total grilling time is between 8 to 10 minutes, depending on the thickness of the veggies used.