Cut the broccoli, carrots, mushrooms, and onion into bite-sized pieces. Place all of the vegetables on a prepared baking sheet.
Drizzle olive oil over the vegetables, then sprinkle them with garlic, oregano, basil, thyme, sea salt, and black pepper. Stir the vegetables, to ensure they are evenly coated in olive oil and spread them out into an even layer.
Roast in the oven for 7 minutes. Carefully remove from the oven to toss the vegetables, then roast for an additional 7 minutes or until they start to turn brown and the veggies are cooked through.
Remove from the oven and allow them to cool slightly before serving. Serve warm. Enjoy!