Separate the yolk from as many egg whites as you are making. In a chilled metal bowl, whisk the whites until stiff peaks form. Mix in whatever you want. Bacon crumbles, chives, parmesan cheese.

Spoon the whites into even piles on a baking sheet and create a well in the center of each pile with the back of the spoon.

Bake at 450F for 3 minutes.

Put a yolk in each well, bake another 3 minutes at 450F.

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