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PRE-HEAT the oven to 180 degrees Celsius or 350 degrees Fahrenheit. PEEL the onion and garlic clove, finely chop the garlic and divide the onion into half thin rings.
HEAT a knob of butter in a skillet and sauté the onion and garlic for a few minutes. Meanwhile COAT an oven dish with butter. PEEL the potatoes and divide them into thin slices.
The easiest way is using a food processor or mandoline. COMBINE the potato slices with the onion and garlic and DIVIDE them evenly over the oven dish.
COMBINE the eggs and cream in a bowl and season with nutmeg, pepper and salt. DIVIDE the mixture over the oven dish and make sure the potatoes are covered as much as possible.
FINISH with a layer of grated cheese.