01 - Preheat oven to 425°F and line a baking sheet with parchment paper.
02 - Toss sweet potato cubes with olive oil, salt, and pepper. Arrange in a single layer on the prepared baking sheet. Roast for 25 to 30 minutes, stirring halfway, until golden and tender.
03 - Combine quinoa, 2 cups water, and 1/2 teaspoon salt in a saucepan. Bring to a boil, then reduce heat to low, cover, and simmer for 15 minutes. Remove from heat and let stand covered for 5 minutes. Fluff with a fork.
04 - In a small bowl, whisk together tahini, lemon juice, water, olive oil, maple syrup or honey, minced garlic, and salt and pepper until smooth. Adjust with additional water if a thinner consistency is desired.
05 - Divide greens evenly among four bowls. Top each with a portion of quinoa, roasted sweet potatoes, cherry tomatoes, red onion slices, and avocado.
06 - Generously drizzle lemon-tahini dressing over each bowl. Top with crumbled feta, roasted seeds, and fresh herbs as desired. Serve promptly.