½ teaspoon each garlic powder, onion powder, dried oregano, smoked paprika, and kosher salt
Fresh ground black pepper, to taste
Optional: lemon wedges
Direction :
Preheat a grill to medium-high heat (375 to 450 degrees).
If using wooden skewers, soak them at least 20 minutes.
Chop the onion into large pieces. Cut bell peppers into chunks. Slice the zucchini into rounds 1/4-inch to 3/8-inch thick. Add the sliced veggies to a bowl with the whole mushrooms and tomatoes toss everything with the olive oil, spices, and salt.
Skewer the vegetables and place each skewers on a baking sheet. Sprinkle with a few more pinches kosher salt and fresh ground black pepper.
Place the skewers directly on the grill. Grill 10 to 12 minutes until tender and blackened, turning every few minutes. If desired, spritz with lemon wedges before serving.