In a large mixing bowl, combine all of the prepared vegetables: broccoli florets, cauliflower florets, diced bell peppers, sliced carrots, and red onion wedges.
Drizzle the olive oil generously over the vegetable mixture. Toss the vegetables thoroughly to ensure they are evenly coated in olive oil.
Sprinkle the dried thyme, dried rosemary, garlic powder, smoked paprika, salt, and pepper over the vegetables. Toss everything once more until each piece is well seasoned.
Spread the seasoned vegetables out in a single layer on a large sheet pan.
Place the sheet pan in the preheated oven and roast for 25-30 minutes, stirring halfway through.
Once the vegetables are perfectly roasted, remove the sheet pan from the oven and allow to cool slightly before transferring to a serving dish.
Before serving, sprinkle freshly chopped parsley over the roasted vegetables.
Notes
Serve on a colorful platter and consider drizzling with balsamic glaze for added flavor.
Keyword herb roasted, roasted vegetables, sheet pan