01 - Preheat oven to 425°F (220°C) and line a baking sheet with parchment paper.
02 - Arrange sweet potato, bell pepper, and red onion on the prepared baking sheet. Drizzle with 1 tablespoon olive oil, season with salt and black pepper, and toss to coat. Roast for 25 to 30 minutes, stirring halfway to ensure even cooking, until vegetables become tender and caramelized.
03 - Place quinoa and 2 cups water in a medium saucepan. Bring to a boil, then reduce to a simmer, cover, and cook for 15 minutes. Remove from heat, keep covered for 5 minutes, then fluff lightly with a fork.
04 - Add lentils to a separate saucepan and cover with ample water. Add a pinch of salt, bring to a boil, then reduce heat and simmer for 20 to 25 minutes until lentils are tender but not mushy. Drain thoroughly.
05 - In a small mixing bowl, whisk together tahini, lemon juice, olive oil, maple syrup or honey, minced garlic, and 2 to 3 tablespoons water until dressing is smooth and pourable. Season to taste with salt and black pepper.
06 - Divide cooked quinoa and lentils among four serving bowls. Top with roasted vegetables, cherry tomatoes, and baby spinach or kale. Generously drizzle with tahini dressing.
07 - Sprinkle bowls with chopped fresh parsley and, if desired, toasted pumpkin seeds. Serve warm or at room temperature.