Prepare all the ingredients: shred the cooked chicken breast, chop the cherry tomatoes, dice the cucumber, slice the avocado, and cook the quinoa according to package instructions.
In a small bowl, combine the Greek yogurt, lemon juice, chopped fresh dill, grated cucumber, minced garlic, salt, and pepper to make the tzatziki sauce. Mix well until all the ingredients are thoroughly combined. Taste and adjust the seasoning, adding more salt, pepper, or lemon juice if desired.
Lay out the tortillas on a clean surface.
Spread a generous spoonful of garlic hummus onto each tortilla, covering the surface evenly.
Evenly distribute the shredded chicken, cherry tomatoes, cucumber, avocado slices, cooked quinoa, crumbled feta cheese, and fresh spinach leaves onto each tortilla.
Drizzle a spoonful of tzatziki sauce over the ingredients on each tortilla.
Carefully roll up each tortilla tightly, tucking in the sides as you go to prevent any filling from falling out.
Once rolled, slice each wrap in half diagonally.
Serve immediately and enjoy your protein-packed and flavorful Mediterranean Chicken Wraps with homemade tzatziki sauce!