Preheat the oven to 425°F. In a stand mixer, mix both flours and salt until thoroughly combined.
Cut in the butter using regular paddles until the pieces are reduced to pea-size. Sprinkle the mixture with cold water, 1 tablespoon at a time, tossing with a fork until all flour is moistened and the pastry almost cleans the side of the bowl (1-2 teaspoons more water can be added if necessary).
Immediately press the pastry into a pie dish with a fork and smooth it with your fingers.
For the filling
Sprinkle turkey bacon, dried onions/leeks, cheese, herbs, salt, and pepper in the pie crust. In a medium bowl, beat the eggs and milk until well blended. Pour into a quiche dish.
Bake for 20 minutes on the middle rack of your oven, then reduce the oven temperature to 325°F. Bake for 45-50 more minutes or until a toothpick inserted in the center comes out clean. Let stand for 10 minutes before serving.
Notes
To reheat, let thaw overnight, then cover with parchment paper and bake for 30 minutes at 350°F.*If you want a grain-free option, use organic almond flour.**If you want a meat-free option, omit the turkey bacon.***Great brands of dairy-free cheese include Daiya, Kite Hill, Follow Your Heart, Forager, Miyokos, So Delicious, and Violife.****1 tablespoon of fresh herbs is equal to 1 teaspoon of dried.