Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Toss the sweet potato, Brussels sprouts, bell pepper, and broccoli with olive oil, salt, and pepper.
Spread vegetables evenly on the baking sheet, ensuring they're not overcrowded.
Roast for 25-30 minutes, stirring halfway through, until vegetables are tender and slightly crispy.
While vegetables are roasting, prepare the tahini dressing by whisking together tahini, lemon juice, maple syrup, and enough water to reach desired consistency.
Assemble the bowls by laying down a bed of greens, adding the cooked grain, arranging the roasted vegetables, and drizzling with tahini dressing.
Top with your chosen garnishes and serve immediately.