Preheat the oven to 400°F (200°C).
In a large mixing bowl, whisk together olive oil, vinegar, garlic, tomato paste, honey, oregano, smoked paprika, cumin, salt, and black pepper until smooth.
Add the eggplant, chickpeas, and onion wedges. Toss until everything is evenly coated.
Spread the vegetables in a single layer on a large baking sheet.
Roast for 30 minutes, until the vegetables are tender and caramelized.
Remove the baking sheet from the oven. Add the cooked quinoa, feta cheese, and lemon juice.
Gently toss everything together, scraping up the flavorful caramelized bits from the pan. This Roasted Eggplant Gyros Bowl becomes even more delicious as all the flavors combine.
Divide into serving bowls and enjoy warm with Greek yogurt or tzatziki if desired.