In a large mixing bowl, combine the cooked shredded chicken, ricotta cheese, large egg, mozzarella cheese, parmesan cheese, garlic powder, Italian seasoning, kosher salt, and black pepper. Stir until everything is well combined.
2 cups cooked shredded or chopped chicken, 1½ cups ricotta cheese, 1 large egg, 1 cup shredded mozzarella cheese, 1/2 cup grated parmesan cheese, 2 teaspoons garlic powder, 2 teaspoons Italian seasoning, 1 teaspoon kosher salt, ¼ teaspoon black pepper