Heat one tablespoon of olive oil in a pan on the stove. Sauté the garlic and onion until they caramelize, for about 5 minutes.
Place the garlic and onion in an oven dish.
Add the potatoes, carrots, peas, broccoli, and eggplant to the dish. Then add the red and yellow bell peppers.
Drizzle the remaining oil, herbs, salt, and black pepper over the vegetables. Place the dish in an oven preheated to 200°C (400°F) for 30 minutes, stirring occasionally.
You can add a little water if needed.
Remove the dish from the oven, drizzle with lemon juice, transfer the vegetables to a serving plate, and serve hot.