8 small cremini mushrooms
1 red or orange bell pepper, cut into 1 1/2-inch pieces
1 small zucchini, cut into 1 1/2-inch pieces
1/2 red onion, cut into 1 1/2-inch pieces
2 tablespoons olive oil
1 tablespoon fresh thyme leaves
Kosher salt and freshly ground black pepper
If using wooden skewers, soak the skewers in water for at least 30 minutes before using.