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Heat oven to 400 degrees.
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Fry bacon until almost burnt. Crush into little pieces.
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Lightly grease pie plate with butter.
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Sprinkle bacon, cheese, and onion in pie plate.
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For extra bacon flavor sprinkle a little bacon fat onto pie pan.
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Beat remaining ingredients until smooth.
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Pour evenly into pie plate over other ingredients.
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Bake until top in golden and knife comes out clean, about 40 minutes.
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Let stand 5 minutes before cutting.