Preheat your oven to 350°F (175°C) and lightly grease a 9x13-inch baking dish.

In a medium saucepan over low to medium heat, add the cream cheese and stir until softened. Gradually incorporate the heavy cream for a smooth sauce, stirring constantly for about 5-7 minutes.

Once the sauce is creamy, add Cajun seasoning and mix well. Incorporate the cooked chicken, cut into bite-sized pieces, followed by the cooked pasta. Stir until the pasta is coated with the sauce.

Pour the mixture into the baking dish, spreading it out evenly. Optionally, add additional cheese or herbs on top.

Bake in the preheated oven for 25-30 minutes until the top is golden and bubbly.

Remove from the oven and let cool for 5-10 minutes before serving. Garnish with sliced green onions or fresh herbs.