In a slow cooker, layer half of the sliced potatoes, followed by half of the steak, half of the cheese, and half of the onion. Repeat the layers.
In a bowl, mix the heavy cream, beef broth, garlic, butter, smoked paprika, black pepper, and salt. Pour the mixture over the layered ingredients in the slow cooker.
Cover and cook on low for 8 hours or until the potatoes are tender.
Notes
You can add extra cheese on top during the last 30 minutes of cooking for a gooey finish.