Place veggies. Put all cut vegetables in a zip top bag or a glass container.
1 cup broccoli florets, 1 cup cauliflower florets, 1 small yellow bell pepper, 1 small orange bell pepper, 1 small red bell pepper, ½ cup zucchini, ½ cup yellow squash, ½ cup red onion (optional)
Make marinade. In a small bowl, combine all ingredients for the balsamic marinate and whisk together.
⅓ cup olive oil, 3 Tablespoons balsamic vinegar, 1 teaspoons black pepper, 1 teaspoons salt, 2 teaspoons Italian seasoning, 2 cloves minced garlic, 2 oz Parmesan cheese
Add marinade to veggies. Add the marinade to the bag or glass container, and gently toss to evenly distribute the marinade over the vegetables.
Marinate veggies. Place the marinating vegetables in the refrigerator and allow them to marinate for 30-40 minutes.
Preheat. Set your grill to 400-425 degrees F for direct heat grilling.
Add veggies to grill basket. Transfer your vegetables from the marinade to a vegetable grill basket (if you don't have a basket, you can grill these directly on the grates, just be cautious and watch that they don't fall through the grates).
Grill veggies. Place the vegetables in the grill basket on the grill, close the lid, and cook for for 20-25 minutes, stirring occasionally. Grill the vegetables until they are cooked to your desired doneness. If you like your veggies crunchy, pull them off after 10 minutes, if you like them softer, leave them on for longer.
Serve and enjoy. You can serve these hot, but you can also refrigerate these and eat cold. They're an awesome way to meal prep or have veggies in lunchboxes.