01 - Preheat oven to 400°F. Grease a 9x13-inch baking dish with cooking spray or butter.
02 - Heat olive oil in a large skillet over medium heat. Add diced chicken and cook for 5-6 minutes until just cooked through. Remove from skillet and set aside.
03 - In the same skillet, sauté onion and garlic for 2-3 minutes until fragrant and softened.
04 - Add zucchini slices and cook for another 4 minutes until slightly tender.
05 - In a large bowl, combine cooked chicken, sautéed vegetables, sour cream, milk, half of the mozzarella, half of the Parmesan, Italian herbs, paprika, salt, and pepper. Mix until well combined.
06 - Spread the mixture evenly in the prepared baking dish. Top with remaining mozzarella and Parmesan cheeses. Sprinkle breadcrumbs evenly over the top.
07 - Bake uncovered for 25-30 minutes, or until golden brown and bubbling.
08 - Let rest for 5 minutes before serving to allow the casserole to set.