Preheat an oven to 180 degrees C. Grease a rectangular baking dish.
Bring a large saucepan of lightly salted water to a rolling boil; boil the ravioli until it floats and the filling is hot; drain.
Melt the butter in a frying pan over medium heat. Add the chicken to the frying pan, season with the Italian seasoning then cook and stir until the chicken is no longer pink in the centre, about 15 minutes.
Spread about 1/2 cup of Alfredo sauce into the bottom of the prepared baking dish. Arrange enough ravioli over the sauce to cover the bottom of the dish completely. Top the ravioli with about half the cooked chicken. Sprinkle 1 cup of the mozzarella cheese over the chicken; season with salt and pepper. Repeat the layers until all ingredients are used.
Bake in the preheated oven until heated through completely and the mozzarella cheese is melted, about 25 minutes. Sprinkle the Parmesan evenly over the top of the dish; return to oven to cook another 5 minutes before serving.