01 - Preheat oven to 400°F. Lightly grease a medium baking dish with cooking spray or a small amount of olive oil.
02 - Heat 1 tbsp olive oil in a large skillet over medium-high heat. Season chicken pieces with salt, pepper, and smoked paprika. Sauté for 4–5 minutes until lightly golden but not fully cooked through. Transfer to a plate and set aside.
03 - In the same skillet, add remaining olive oil. Sauté onion for 2 minutes until translucent, then add garlic and cook until fragrant, about 30 seconds.
04 - Add zucchini and sun-dried tomatoes to the skillet. Cook for 3–4 minutes until zucchini begins to soften. Stir in spinach and cook until just wilted. Remove from heat.
05 - In a mixing bowl, combine heavy cream, oregano, basil, chili flakes (if using), half the feta, and half the mozzarella. Season with salt and pepper to taste.
06 - Arrange sautéed vegetables and chicken pieces in the prepared baking dish. Pour cream mixture evenly over the top, ensuring all ingredients are coated.
07 - Sprinkle with remaining feta, remaining mozzarella, and all the Parmesan cheese, distributing evenly across the surface.
08 - Bake for 25–30 minutes, or until chicken is cooked through (internal temperature reaches 165°F) and the top is golden brown and bubbling.
09 - Let the dish rest for 5 minutes before serving to allow flavors to settle. Garnish with fresh basil leaves and serve warm.