Make the fajita seasoned marinade by combining all ingredients in small bowl; set aside.
Chop bell peppers and red onion into large chunks, and zucchini into about 1/4' thick rounds
Place vegetables on soaked skewers, alternating the vegetables as you go, leaving just a little space in between.
Transfer vegetable kabobs to the grill in a single layer, brushing with the marinade. Grill the veggies about 5 minutes, flip, brush with marinade again and continue cooking another 3-4 minutes. Let the veggies get a little charred for extra smoky flavor.
Remove vegetable kabobs from grill, placing on metal sheet and covering with foil until ready to enjoy.
Notes
STORAGE - store leftovers in covered container in fridge; best enjoyed within 1-2 days.