01 - Preheat the oven to 425°F. Line a large baking sheet with parchment paper.
02 - In a large bowl, combine the zucchini, bell peppers, and red onion.
03 - Drizzle with olive oil, then sprinkle with smoked paprika, garlic powder, oregano, salt, and black pepper. Toss until vegetables are evenly coated.
04 - Spread the vegetables in a single layer on the prepared baking sheet.
05 - Roast for 20–25 minutes, stirring halfway through, until vegetables are tender and lightly charred at the edges.
06 - Transfer to a serving platter. Garnish with chopped parsley and lemon zest, if desired. Serve warm.