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1. Preheat your oven to 400°F (200°C).
2. In a medium bowl, combine the olive oil, lemon juice, salt, black pepper, and dried dill. Mix well to create a marinade.
3. Cut the chicken breasts into bite-sized pieces and add them to the marinade. Ensure all pieces are well coated. Let the chicken marinate for at least 15 minutes. For best results, marinate for 1-2 hours in the refrigerator.
4. Heat a large skillet over medium-high heat. Add the marinated chicken pieces to the skillet and cook for about 5-7 minutes, stirring occasionally, until the chicken is cooked through and no longer pink in the center. Use a meat thermometer to ensure the internal temperature reaches 165°F (75°C).
5. Remove the chicken from the skillet and set aside to cool slightly.
6. In a mixing bowl, combine the Greek yogurt, grated cucumber, minced garlic, salt, and black pepper.
7. Mix well until all ingredients are fully incorporated. If you prefer a thinner consistency, you can add a little water or extra lemon juice.
8. Cover the bowl with plastic wrap and refrigerate the tzatziki sauce for at least 15 minutes to allow the flavors to meld together.
9. Once the chicken has cooled slightly and the tzatziki sauce is ready, place the naan breads on a baking sheet lined with parchment paper.
10. Spread a generous amount of tzatziki sauce over each naan, leaving a small border around the edges.
11. Evenly distribute the cooked chicken pieces over the tzatziki-covered naan.
12. Add the halved cherry tomatoes and sliced red onion on top of the chicken.
13. Sprinkle a generous amount of shredded mozzarella cheese over each naan.
14. Place the baking sheet in the preheated oven.
15. Bake the naan pizzas for about 10-12 minutes, or until the cheese is melted and bubbly, and the edges of the naan are golden brown.
16. Keep an eye on the pizzas to prevent burning, as oven temperatures can vary.
17. Once done, remove the naan pizzas from the oven and let them cool for a couple of minutes.
18. Slice the naan pizzas into quarters or halves, depending on your serving preference.
19. Garnish with fresh parsley or dill if desired.
20. Serve warm, alongside extra tzatziki sauce for dipping.
21. Enjoy your delicious and flavorful tzatziki chicken naan pizzas with friends and family!

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