01 - Preheat the oven to 425°F. Line a large baking sheet with parchment paper.
02 - In a small bowl, whisk together olive oil, minced garlic, soy sauce, sriracha, maple syrup, sesame oil, rice vinegar, black pepper, and a pinch of salt until well combined.
03 - Place Brussels sprouts, carrot, bell pepper, red onion, and broccoli in a large mixing bowl. Pour half of the spicy garlic sauce over the vegetables and toss to coat evenly.
04 - Spread the vegetables in a single layer on the prepared baking sheet. Roast for 25 to 30 minutes, tossing halfway through, until vegetables are golden and tender.
05 - While the vegetables roast, prepare brown rice or quinoa according to package instructions, if not already cooked.
06 - Remove the roasted vegetables from the oven, transfer to a large bowl, and toss with the remaining spicy garlic sauce.
07 - Divide the rice or quinoa among four bowls. Top generously with the roasted vegetables.
08 - Sprinkle with toasted sesame seeds, sliced spring onions, and fresh herbs if desired. Serve immediately.