Preheat your oven to 200°C (400°F). Line a large baking sheet with parchment paper or a silicone baking mat to prevent sticking.
Arrange the sliced eggplant and bell peppers on the baking sheet, tossing them with 1 tablespoon of olive oil, minced garlic, salt, pepper, and herbs. Spread them out in an even layer, leaving space for other vegetables.
Roast the eggplant and peppers in the oven for about 15 minutes, until they start to soften and turn golden around the edges. The kitchen will fill with a fragrant aroma.
Remove the baking sheet from the oven and gently toss the roasted eggplant and peppers with the remaining olive oil. Arrange the zucchini slices over the roasted vegetables, then layer the tomato slices on top, creating a colorful, stacked look.
Return the tray to the oven and roast for another 10-15 minutes, until the zucchini and tomatoes are tender and slightly caramelized at the edges. The vegetables should be fragrant and bubbling.
Check the vegetables; they should be soft and flavorful, with edges that are crispy and browned. If desired, sprinkle with fresh herbs or additional salt and pepper before serving.
Finish by drizzling a little more olive oil over the vegetables and serving hot, straight from the baking sheet. This dish pairs beautifully with crusty bread or served over grains.