01 - Set oven to 425°F. Line a baking sheet with parchment paper to prevent sticking.
02 - Spread trimmed asparagus and carrot sticks evenly on the prepared baking sheet.
03 - Drizzle with olive oil and scatter sea salt, black pepper, and dried thyme across the vegetables. Toss thoroughly to coat all sides.
04 - Roast in the preheated oven for 20–25 minutes, turning vegetables halfway through, until they are softened and lightly browned.
05 - Immediately after removing from the oven, toss with lemon zest and lemon juice. Top with grated Parmesan if desired. Serve while warm.