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Peel and slice the onions into rings
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Heat the butter and oil in a large skillet.
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Add the onions and stir to coat.
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Cook the onions down, sautéing occasionally until caramelized.
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Deglaze the pan with the wine.
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Preheat the oven to 350°F
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Grease a casserole dish.
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Place half of the caramelized onions on the bottom.
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Lay the matzoh balls on top and sprinkle half the cheese over the Matzoh balls.
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Distribute the remaining onions over the top and sprinkle the remaining cheese over the onions.
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Bake for 30 minutes.
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Serve from the casserole dish.