Grease the inside of the slow cooker with olive oil to prevent sticking.
In a bowl, combine the heavy cream, minced garlic, salt, and pepper.
Sprinkle the potatoes with half of the Gruyère cheese.
Pour half of the cream mixture over the cheese.
Repeat these layers with the remaining potatoes, cheese, and cream mixture. Cover and simmer for 4–5 hours, or until the potatoes are tender. About 30 minutes
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