Preheat the Oven: Preheat your oven to 400°F (200°C).
Prepare the Vegetables: In a large bowl, combine the sliced zucchinis, bell peppers, cherry tomatoes, and minced garlic. Drizzle with olive oil, season with salt, pepper, and oregano, and toss to coat.
Arrange the Vegetables: Spread the vegetable mixture evenly on a baking sheet lined with parchment paper.
Prepare the Sea Bass: Season the sea bass fillets with salt and pepper. Place them on top of the vegetables on the baking sheet.
Bake: Bake in the preheated oven for 20-25 minutes, or until the sea bass is cooked through and the vegetables are tender.
Serve: Garnish with fresh parsley and serve with lemon wedges on the side.