01 - Preheat oven to 425°F (220°C) and line a baking sheet with parchment paper.
02 - In a mixing bowl, toss diced sweet potato, chopped bell pepper, and sliced zucchini with olive oil, smoked paprika, ground cumin, salt, and pepper. Arrange vegetables evenly on the prepared baking sheet.
03 - Roast vegetables in the oven for 20 to 25 minutes, stirring halfway through, until golden and tender.
04 - While vegetables are roasting, combine rinsed quinoa, water, and salt in a saucepan. Bring to a boil over medium heat, then reduce to low, cover, and simmer for 15 minutes until water is absorbed. Remove from heat and let stand covered for 5 minutes. Fluff grains with a fork.
05 - For the dressing, whisk together tahini, lemon juice, maple syrup or honey, water, minced garlic, salt, and pepper in a bowl until smooth. Adjust consistency by adding more water as needed for drizzling.
06 - Divide cooked quinoa evenly among four bowls. Top each portion with roasted vegetables, halved cherry tomatoes, sliced avocado, baby spinach or mixed greens, and crumbled feta cheese if desired.
07 - Drizzle with prepared tahini dressing and serve immediately.