Gratin with root vegetables

We found some turkey fillets in the supermarket that we tried last year and were really nice. They are prepared already with marinade and sauce so you just need to put them in the oven. I was trying to figure out what to have with it and I thought of potato gratin which we haven't had in a long time. I made my own version of it though and put some other root vegetables in it as well.

Ingredients
(serves 2-3)
2 large potatoes
3 small parsnips
2 carrots
1 onion
3 garlic cloves
150-200 ml cream
2 tbsp butter
salt and pepper to taste

Preheat the oven to 200 degrees. Melt the butter. Peel and slice all the vegetables into thin slices. Put them all in an oven proof dish. Take the skin off the garlic and crush it over the other vegetables. Add some salt and pepper and mix it all together. Mix the butter and the cream and add some more salt and pepper. Pour it over the vegetables and put in the oven for about 45 minutes or until the vegetables are cooked. Serve together with a delicious steak or like us with some oven cooked turkey fillets.