To prepare the marinade, combine the olive oil, vinegar, salt, Italian seasoning blend, and garlic powder in a small bowl. Whisk well and set aside.
Place eggplant, asparagus, zucchini, summer squash, red pepper, onion slices and artichoke hearts in a large mixing bowl. Pour the marinade over the vegetables and toss gently. Let the vegetables marinate for 15 minutes.
Heat grill to medium high heat.
Place vegetables on grill, and grill until slightly charred, about 3-4 minutes. Gently flip all vegetables and cook on the other side until lightly charred with grill marks.
Remove vegetables and return to their bowl. Let cool.
Remove outer skin from red peppers, and cut all vegetables into desired size, or leave whole.
Notes
Serve these grilled vegetables warm as a side dish or cold added to a grain salad.Leftover grilled vegetables are good for up to 3 days when stored in the refrigerator in a tight-fitting container.