Preheat the oven to 400°F (200°C). Rinse and drain the canned chickpeas, then pat dry. Toss them with a pinch of salt, pepper, and a light drizzle of olive oil if desired, and spread on a baking sheet.
Peel and cube the sweet potato. Toss with a small amount of olive oil, salt, and pepper, and place on another baking sheet.
Roast the chickpeas for about 25-30 minutes until crispy, and roast the sweet potato cubes for 20-25 minutes until tender and slightly caramelized.
While the chickpeas and sweet potato are roasting, prepare the quinoa according to package instructions. For a smaller portion, measure out 1/3 cup of cooked quinoa.
In a small bowl, whisk together tahini, lemon juice, minced garlic, and water until smooth to create the creamy dressing.
Lightly cook the egg whites in a non-stick skillet over medium heat until set, stirring occasionally.
Assemble your bowl: layer the baby spinach at the base, then add quinoa, roasted sweet potato, roasted chickpeas, and cooked egg whites.
Drizzle the creamy tahini dressing over the bowl, season with additional salt and pepper if needed, and serve immediately.