Mexican grilled veggie skewers are full of vibrant flavors. Use a combination of vegetables like bell peppers, red onions, zucchini, and cherry tomatoes. Toss the vegetables in a Mexican spice blend made with chili powder, cumin, paprika, and garlic powder. Thread the vegetables onto skewers and grill them until they are nicely charred and tender. These skewers are perfect for a Mexican-themed barbecue or as a side dish with some warm tortillas and salsa.