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1
For mom's flaky pie dough: Combine the flour, butter, sugar and salt in a food processor and pulse until the chunks are pea-sized.
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2
Add the ice water 1 tablespoon at a time and pulse until the dough just begins to clump together against the walls of the processor.
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3
Dump the dough out onto a work surface and press together to make a cohesive ball, kneading once or twice if it is falling apart.
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4
Divide the dough in half, wrap 1 portion in plastic wrap and refrigerate for 1 hour before rolling out.
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5
(This recipe makes a double portion of dough; if you are only using 1 portion, wrap the other half in 2 layers of plastic wrap, place in a resealable plastic bag and freeze for another use.)
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6
Preheat the oven to 350 degrees F.
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7
On a well-floured surface and using a well-floured rolling pin, roll out the pie dough into a 9- to 10-inch round.
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8
Lightly flour the pin as needed to prevent sticking; if the dough tends to stay sticky while rolling, refrigerate it until firm and begin again.
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9
Use a large flat spatula or bench scraper to transfer the dough to a 9-inch pie plate and press into shape using a fork.
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10
Place a sheet of parchment paper or foil into the pie shell and fill with pie weights, uncooked rice or dried beans.
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11
Bake until the edges are lightly golden, about 25 minutes.
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12
Remove the pie crust but keep the oven on.
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13
For the quiche: While the crust is baking, heat the oil in a medium skillet over medium-low heat.
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14
Add the mushrooms and cook until well browned and cooked through, stirring occasionally, 10 minutes.
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15
Then add in the mixed veggies to cook out any excess water and wilt the spinach leaves.
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16
Remove from the heat.
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17
In a large bowl, combine the eggs, cream, parsley, thyme, nutmeg, salt and pepper in a large bowl and lightly whisk.
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18
Sprinkle half of the Gruyere, Cheddar and Parmigiano-Reggiano on the crust, followed by the veggie mixture and then the remaining cheese.
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19
Pour the egg mixture over the top and bake until set, about 35 minutes.
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20
Cool for 15 minutes, then cut into wedges and serve.
