Preheat the oven to 360 degrees Fahrenheit and grease an oven proof dish with butter.
Dice the celeriac into large chunks and then slice thinly by hand or with a food processor slice attachment.
Add the butter, cream cheese, cream and sliced garlic to a large saucepan over a low/medium heat.
Add the celeriac to the pan and stir well to ensure it is coated in the sauce. Season well and simmer for 10 minutes until the celeriac is tender.
Transfer the mixture to your buttered baking dish or divide between individual ramekins.
Bake for 15-20 minutes until golden brown and bubbling.
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