From Bangkok, Thailand. Just delved into my myriad collection of recipes and posted one for you. I do not know what your recipe is but is probably similar. Us chefs use cream for a reason - it tastes better and makes a better product. If you want to substitute anything for cream use half-and-half which has a lower content of butter fat but is still acceptable.
Enjoy.
thanx all. 'nuf sed.
plamuk, aka travellingchef
Gratin Dauphinois
Ingredients
900 gr/2 lb baking potatoes, 2 eggs, beaten, 65 ml/1/4 cup milk, 500 ml/2 cup 35-40% cream, sea salt and white pepper to taste, Cheddar cheese, grated
Method
Prepare a 15 cm x 25 cm/6” x 10” dish by lightly buttering the inside. Set aside. In a saucepan, bring the milk, cream, and salt and pepper (both to taste) to the boil then remove from the heat. Pour into a bowl and when cool, stir in the beaten eggs.
Preheat the oven to 165OC/325OF. Peel the potatoes and cut into 1/2 mm/1/4” slices. Lay the slices into the prepared dish. Continue until all of the potatoes are used. Pour the cream mixture over the top. Press down the potatoes. The liquid should be just below the top layer of potatoes. Bake for 1 1/2-2 hours, gently pressing down the potatoes every 15-20 minutes. When the top appears a golden color, do not press anymore. Test to make sure the potatoes are cooked right through then turn off the oven and leave for 10 minutes before serving.