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Preheat oven to 425 degrees, put rack in middle position.
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Cook noodles in a 6 or 8 quart pot with salted water until al dente, about 5 minutes, drain and rinse in cold water, then drain well.
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Melt butter in a heavy skillet over medium heat, brush muffin tins with some butter.
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Add onions and cook until well browned, about 20 minutes.
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In a large bowl, mix onions, noodles, sour cream, cottage cheese, poppy seed.
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Lightly beat eggs with salt and pepper, add to the mixture and mis until well combined.
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Divide the mix into 12 muffin tins and bake for about 20-25 minutes.
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Loosen kugels with a thin pairing knife, let cool 5 minutes before serving.