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Preheat oven to 350 degrees F.
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Whisk together eggs, milk, salt, pepper, nutritional yeast, and paprika.
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Stir in leeks, asparagus, and mushrooms as desired. Save a few pieces of asparagus and/or mushrooms to sprinkle on top of the quiche before baking.
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Spray mini muffin tray with cooking spray.
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Cut each slice of prosciutto into 3 pieces and place one piece into each mini muffin cup. Press down to form a prosciutto cup.
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Divide egg mixture into each cup and top with the extra asparagus and mushroom.
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Bake at 350 degrees F for 20 minutes.