Begin by shredding or dicing your cooked chicken.

Melt unsalted butter in a skillet over medium heat and sauté the chopped onion and minced garlic until translucent.

Add heavy cream and gradually whisk in Parmesan cheese until the sauce becomes smooth.

Fold the cooked chicken into the sauce, adding optional ingredients if desired, and heat gently.

Toast the sandwich buns and spoon the creamy chicken mixture onto the toasted buns.