Rinse 1 cup of quinoa under cold water to remove any bitterness. In a medium saucepan, combine rinsed quinoa with 2 cups of water. Bring to a boil, then reduce heat to low, cover, and simmer for about 15 minutes or until all water is absorbed. Remove from heat and let it sit covered for 5 minutes, then fluff with a fork.
While quinoa cooks, dice the small cucumber, halve the cherry tomatoes, finely chop the red onion, and roughly chop the parsley. Place all the chopped vegetables in a large mixing bowl.
Open one can of chickpeas, rinse them under cold water, and drain well. Add them to the bowl with the vegetables.
In a small bowl, whisk together 1/4 cup tahini, 2 tablespoons lemon juice, 2 tablespoons olive oil, and 1 minced garlic clove. Add salt and pepper to taste. If the dressing is too thick, add a tablespoon of water at a time until it reaches a smooth, pourable consistency.
Add the cooked quinoa to the chickpea and vegetable mixture. Pour the tahini dressing over the top and toss gently to combine everything evenly.
If using, dice grilled chicken or turkey and add it to the bowl for extra protein. Toss lightly again to distribute.
Divide the Mediterranean Chickpea Bowls With Tahini into serving bowls. Garnish with extra parsley or a drizzle of olive oil if desired. Serve immediately or refrigerate for later.