In a small bowl, combine Greek yogurt, grated cucumber, minced garlic, chopped dill, lemon juice, salt, and pepper. Stir well to combine. This is your Tzatziki sauce.
Warm the tortillas slightly according to package directions, if desired.
Spread a generous amount of Tzatziki sauce onto each tortilla.
Layer the spinach, shredded chicken, cucumber, red onion, tomatoes, feta cheese, and olives onto each tortilla.
Fold or roll up the tortillas to create wraps. Serve immediately.
Notes
For a vegetarian option, omit the chicken and add chickpeas or grilled halloumi.