Grilled vegetables (simple marinade)

Hi ! :-)
Grilled vegetables are really tasty as they are but if you marinade them first...OMG!

So, my very simple marinade -
2 tablespoons olive oil
2 tablespoons chopped fresh parsley
2 tablespoons chopped fresh oregano
2 tablespoons chopped fresh basil
1 tablespoon balsamic vinegar
1 teaspoon kosher salt
1/2 teaspoon black pepper
6 cloves garlic, minced
1 red onion, cut into wedges
18 spears fresh asparagus, trimmed
1/2 butternut squash, cubed
1 (1 pound) eggplant, sliced into 1/4 inch rounds
1 red bell pepper, cut into wedges
1 yellow bell pepper, cut into wedges

In a large resealable plastic bag, mix the olive oil, parsley, oregano, basil, vinegar, kosher salt, pepper, and garlic. Place the onion, asparagus, eggplant, red bell pepper, and yellow bell pepper into the bag. Seal, and marinate 2 hours in the refrigerator, turning occasionally. And Grill them.
About butternut squash - after it was all covered with marinade, I just put all the cubes on a foil (with vegetable cooking spray). Preheated oven to 400 degrees and put the foil on a baking sheet in the oven for 40-50 minutes (or until tender)