In a small bowl stir the Greek yogurt, cucumber, dill, and lemon. Taste and season with s&p. Place in refrigerator while you make the quesadillas. This will give the sauce time for the flavors to meld.
Quesadillas
Preheat oven to 400°F. Line a baking sheet with parchment paper.
Place 2 tortillas on the baking sheet (my baking sheet only fit 2). Top tortilla with some mozzarella, olives, red peppers, feta cheese, chicken, and a little more mozzarella, then lastly sprinkle on some fresh chopped dill. Top with another tortilla. Continue until you’ve made 4 quesadillas.
Bake for 8-10 minutes or until cheese is melty.
Transfer the quesadilla to a plate and cut into quarters. Serve immediately with the tzatziki sauce.