Let's start with the crust. If you don't want to bother making your own crust, you can substitute a store-bought frozen or refrigerated crust. You can also make the crust ahead and freeze it.
Crust
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Step 1
Combine the flour and salt in a large bowl.
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Step 2
Sprinkle cubed butter over the top.
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Step 3
Incorporate the butter using a pastry cutter or two forks.
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Step 3
Add water and continue blending until mixture holds together.
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Step 4
Place in a food storage bag and flatten into a disc shape. Refrigerate.
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Step 5
After 30 minutes, remove dough from fridge and roll into a 12-inch diameter circle.
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Step 6
Transfer dough to a 9-inch tart pan and gently press into the bottom and sides, leaving 1/2 inch overhang.
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Step 7
Fold overhanging dough in against the sides of the pan to form a sturdy side. Freeze for 30 minutes.
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Step 8
Lay a piece of parchment paper inside the pan, and cover with pie weights. Bake crust until lightly browned.
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Now it's time for the filling. To save time in the morning, you can cook the vegetables a day ahead and store them in an airtight container in the fridge.
Filling
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Step 1
Melt butter in a skillet over medium heat. Add mushrooms and leeks.
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Step 2
Cook, stirring occasionally, until tender, about 10 minutes. Transfer to a plate to cool.
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Step 3
Meanwhile, add eggs, milk, cream, salt & pepper to a blender and blend on low for 30 seconds.
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Step 4
Evenly spread leek & mushroom mixture in the bottom of baked crust then sprinkle with herbs.
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Step 5
Sprinkle Parmesan cheese evenly over the top of the leek and mushroom mixture.
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Step 6
Pour egg mixture over the top and bake for 45-50 minutes. About 15 minutes in, arrange a few extra leek rounds and mushrooms decoratively over the top.
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The quiche is done when the filling is set and lightly browned. Remove to a wire rack and allow to cool.
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Enjoy!
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