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 sheet. Roast for 25 to 30 minutes, stirring halfway through, until golden and fully tender.
03 - Combine quinoa, water, and 1/2 teaspoon salt in a saucepan. Bring to a boil, reduce heat to low, cover, and simmer for 15 minutes. Remove from heat and rest for 5 minutes before fluffing with a fork.
04 - In a small bowl, whisk together tahini, lemon juice, water, olive oil, maple syrup or honey, minced garlic, salt, and pepper until smooth. Adjust water for desired thickness.
05 - Divide greens among four individual bowls. Add a portion of cooked quinoa, roasted sweet potatoes, halved cherry tomatoes, red onion slices, and avocado slices to each bowl.
06 - Drizzle bowls with lemon-tahini dressing. Sprinkle with feta cheese, seeds, and fresh herbs as desired. Serve immediately.