Preheat your grill to medium-high heat.
In a mixing bowl, whisk together the yogurt, herbs, garlic, lemon juice, salt, and pepper. Set aside.
In a separate mixing bowl, toss together the bell pepper, squash, zucchini, eggplant, and red onion with olive oil, salt, and pepper.
Arrange the vegetables on a grilling basket or skewers, making sure they are evenly spaced and not overcrowded.
Place the vegetable basket or skewers on the grill and cook for about 10-15 minutes, rotating occasionally, until the vegetables are tender and slightly charred.
Remove the vegetables from the grill and let them cool for a few minutes.
Arrange the grilled vegetables on a platter and serve with the herb yogurt dip on the side.
Enjoy your delicious grilled veggie platter with herb yogurt dip!