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Preheat the oven to 375°F (190°C) and grease a 24-cup mini muffin tin.
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In a food processor, pulse together the flour, butter, and water until a dough forms. Divide the dough into 24 portions and press each portion into the muffin cups.
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In a skillet, cook the bacon until crisp. Add the onion and sauté until soft and golden brown.
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Spoon the bacon and onion mixture into the muffin cups, then sprinkle the blue cheese on top.
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Whisk together the cream, eggs, salt, and pepper in a bowl until smooth. Pour the mixture into the muffin cups, filling each one about 3/4 full.
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Bake the quiches for 20-25 minutes or until golden brown and set. Allow them to cool for a few minutes before serving.