Place bacon in a large, deep skillet. Cook over medium high heat until evenly brown. Drain, crumble and set aside.
Preheat oven to 350 degrees F (175 degrees C). Lightly grease a 9 inch pie pan.
Line bottom of pie plate with cheese and crumbled bacon. Combine eggs, butter, onion, salt, flour and milk; whisk together until smooth; pour into pie pan.
Bake in preheated oven for 35 minutes, until set. Serve hot or cold.
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