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Peel the onions and cut them into rings.
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Heat the oil in a pan and sauté the onions until transparent.
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Season with salt and pepper.
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Remove from heat and set aside.
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Preheat the oven to 400F. Line a 9 x13 baking pan with parchment paper.
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Grease the paper and the sides of the pan.
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Whisk together the flour, baking powder, and salt.
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Separately whisk together the vegetable oil and the buttermilk.
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Add to the dry ingredients and knead into a dough.
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Roll it out thinly on a lightly floured surface.
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Transfer the dough to the prepared baking pan.
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Whisk together the cream and eggs.
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Add the onions.
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Mix in the grated cheese.
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Season with salt, pepper and nutmeg.
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Spread the onion mixture over the dough.
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Bake for 45 minutes.
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Cut and serve.