In a medium bowl, mix together olive oil, lemon juice, minced garlic, dried oregano, salt, and black pepper to create a flavorful marinade. Add the chicken breast, ensuring it is well coated. Allow the chicken to marinate for at least 30 minutes at room temperature.

Preheat your grill to medium-high heat. Once hot, place the marinated chicken onto the grill and cook for 5-6 minutes on each side, or until charred and reaches 165°F. Allow the chicken to rest for a few minutes before slicing.

Brush both sides of each naan with olive oil. Heat a skillet over medium-high heat and toast the naan for about 1-2 minutes on each side until golden brown and crisp.

Place the toasted naan on a baking sheet, layer it with grilled chicken slices, cherry tomatoes, and red onion. This combination enhances flavor and adds color.

Preheat your oven to 400°F. Bake the assembled naan pizzas for about 5-7 minutes until heated through and edges are golden.

Remove from the oven and drizzle tzatziki sauce over the top. Finish with fresh parsley for flavor and color. Slice and serve warm.