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Preheat the oven to 350 degree F.
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Line the inside of ramekins or small jars with the bacon. Crack an egg into each one and top with the onions and mushrooms. Season with salt and pepper.
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At this point, you can either cover them with plastic wrap and refrigerate until ready to serve or bake immediately.
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Bake in a 350 degree oven for 10 minutes, or until egg is set. Serve warm.