In a large mixing bowl, combine the cooked quinoa, parsley, cucumber, tomatoes, mint, and red onion or green onion, if using.
Drizzle the lemon juice and olive oil over the tabbouleh mixture. Season with salt and pepper to taste. Toss until well combined. Set aside.
Warm the tortillas slightly to make them more pliable, either in a dry skillet or microwave.
Spread a generous layer of hummus onto each tortilla, leaving a small border around the edges.
Place a handful of baby spinach leaves (or a spoonful or two of sautéed spinach) on top of the hummus layer.
Spoon a portion of the tabbouleh mixture onto each tortilla, spreading it evenly over the spinach leaves.
If desired, add a drizzle of tahini sauce, sliced avocado, olives, or pickled vegetables on top of the tabbouleh.
Roll up the tortillas tightly to form wraps, tucking in the edges as you go.
Slice the wraps in half diagonally and serve immediately, or wrap them tightly in foil or parchment paper for a portable meal.
Enjoy your delicious and nutritious Hummus Tabbouleh Wraps!