Preheat and prep pans: Heat the oven to 425°F (220°C). Line two large sheet pans with parchment for easy cleanup and better caramelization.
Prep the veggies: Cut sweet potatoes into 3/4-inch cubes. Slice bell pepper, onion, and zucchini.
Break broccoli into medium florets. Pat chickpeas dry with a clean towel to help them crisp.
Season the mix: In a large bowl, toss sweet potatoes, broccoli, bell pepper, onion, zucchini, and chickpeas with 3 tablespoons olive oil, smoked paprika, cumin, garlic powder, 1/2 teaspoon salt, and black pepper. Mix until everything is well coated.
Spread and roast: Divide evenly between the two sheet pans.
Don’t overcrowd; space helps browning. Roast for 25–35 minutes, tossing once halfway, until edges are browned and veggies are tender. Sweet potatoes should be soft in the center with caramelized edges.
Cook or warm the grain: While veggies roast, cook brown rice or quinoa if you haven’t already.
Aim for about 1/2–3/4 cup cooked grain per bowl.
Make the lemon-tahini sauce: In a small bowl, whisk tahini, lemon juice, lemon zest, grated garlic (if using), a pinch of salt, and 2 tablespoons warm water. Add more water, 1 tablespoon at a time, until it’s pourable. Taste and adjust with more lemon or salt as needed.
Assemble the bowls: Add a scoop of rice or quinoa to each bowl.
Top with a generous portion of roasted veggies and chickpeas. Drizzle with lemon-tahini sauce.
Finish with freshness: Sprinkle chopped parsley or cilantro. Add optional avocado slices, pumpkin seeds, or red pepper flakes for extra texture and heat.
Serve: Enjoy warm.
If serving later, keep the sauce separate until just before eating.