European Kitchen - Grilled potatoes with cream and cheese

Ingredients for the recipe:

- 100 grams of grated Gruyère cheese- 100 grams of grated Parmesan cheese- 2 cups of cream- 2 cloves of minced garlic- 1 tablespoon of chopped fresh thyme- Salt and black pepper- 2 kilograms of peeled and sliced potatoes- 2 tablespoons of butter- Rosemary for garnish