Prepare the Spice Blend: In a small bowl, combine the dried oregano, garlic powder, smoked paprika, sea salt, and black pepper. Whisk to mix evenly and set aside.
Season the Vegetables: In a large bowl, combine all the chopped vegetables. Drizzle with 3 tablespoons of extra virgin olive oil, then sprinkle with about half of the prepared Aegean Spice Blend. Toss gently until all the vegetables are lightly and evenly coated.
Assemble the Skewers: Preheat your grill to medium-high heat, around 400-450°F (200-230°C). Thread the seasoned vegetables onto your skewers, alternating between them to create a colorful pattern.
Grill the Skewers: Place the skewers on the hot grill grates. Cook for 10-12 minutes, turning them every 3-4 minutes, until the vegetables are tender-crisp and have developed appealing char marks.
Mix the Drizzle: While the skewers are on the grill, prepare the finishing drizzle. In a small bowl, whisk together the ¼ cup of extra virgin olive oil, fresh lemon juice, chopped parsley, chopped mint, and the optional minced garlic.
Serve: Remove the skewers from the grill and arrange them on a platter. Sprinkle the remaining Aegean Spice Blend over the hot vegetables. Just before serving, drizzle generously with the Lemony Herb Drizzle.