Tasty Potato and Onion Gratin

Tasty Potato and Onion Gratin
Ingredients:
1 kg potatoes, peeled and thinly sliced
2 yellow onions, thinly sliced
200 g grated cheese (Gruyere or Comté)
250 ml heavy cream
100 ml vegetable or chicken stock
2 tbsp butter
1 tbsp olive oil
Salt and pepper to taste
1 tsp dried thyme
Preparation:

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