Start by preheating your oven to 400°F (200°C). While the oven heats, wash and chop all the vegetables into evenly sized pieces so they roast at the same speed. In a large bowl, toss zucchini, bell pepper, broccoli, and red onion with olive oil, garlic powder, paprika, salt, and black pepper until everything is well coated.
Spread the seasoned vegetables in a single layer on a lined baking sheet. Make sure they aren’t overcrowded, or they’ll steam instead of roast. Bake for 25 to 30 minutes, flipping halfway through, until the edges are golden brown and slightly crispy while the centers remain tender.
While the vegetables are roasting, cook your quinoa or brown rice according to package instructions if it’s not already prepared. Fluff it with a fork once cooked to keep it light and airy. A warm grain base helps the hummus soften slightly when layered on top.
To assemble, start by adding a generous scoop of quinoa or rice to each bowl. Spoon a large dollop of hummus on one side and gently spread it across part of the base. Arrange the roasted vegetables over the grains, then top with cherry tomatoes, diced cucumber, and fresh parsley for brightness and crunch.
Drizzle lemon juice over the entire bowl just before serving to brighten all the flavors. You can also add a final sprinkle of salt or a drizzle of olive oil if needed. Serve immediately while the vegetables are warm and slightly crisp.