In a small bowl, thoroughly mix together the heavy whipping cream, chicken broth, minced garlic, salt, and pepper.
Prepare the slow cooker by applying a coating of non-stick cooking spray.
Begin layering the sliced potatoes at the bottom of the slow cooker, using approximately one-third of the total amount.
Over the potatoes, evenly distribute one-third of the cream mixture, followed by one-third of the amounts of both cheddar and Parmesan cheeses.
Repeat the layering process until all the potatoes, cream mixture, and cheeses have been used.
Secure the lid on the slow cooker and set to cook on high for a duration of 3 to 4 hours, or until the potatoes have reached a tender consistency.
Optionally, garnish the dish with parsley before serving.
Serve the scalloped potatoes immediately while hot.