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Preheat oven to 450°F.
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For crust: put flour, baking powder and salt in a bowl.
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Work in butter, until mixture resembles coarse meal.
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Add buttermilk, gradually, mixing until a somewhat sticky dough is formed,
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Turn onto floured board.
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Knead briefly until smooth.
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Line a 9- inch springform pan.
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Chill until ready to use.
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For filling: Saute onions in butter until transparent.
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Spread over dough.
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Mix sour cream and seasonings with beaten eggs.
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Blend thoroughly.
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Pour mixture over onions.
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Bake 10 minutes.
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Reduce oven to 350°F and bake 45 minutes more.
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Slice in wedges.
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Serves 4 as a main dish or 6-8 as a vegetable dish.