01 - Preheat oven to 425°F. Line a large rimmed baking sheet with parchment paper for easy cleanup.
02 - Spread asparagus spears and carrot sticks in a single even layer across the prepared baking sheet, ensuring pieces do not overlap for consistent roasting.
03 - Drizzle olive oil evenly over vegetables. Sprinkle with sea salt, black pepper, garlic powder, and dried thyme. Toss gently with hands or tongs until all pieces are thoroughly coated.
04 - Roast for 22–25 minutes, removing halfway through to toss vegetables for even browning. Cook until tender when pierced with a fork and edges show light caramelization.
05 - Transfer roasted vegetables to a serving platter. Sprinkle with fresh parsley and lemon zest if using. Serve immediately while hot, or allow to cool to room temperature.