Caramelized Onion, Smoked Turkey, Mushroom and Gruyere Quiche Wi

This recipe is adapted from Ellie Krieger. I've added Smoked turkey, bacon or ham would work just as well. the crust is surpisingly good with the mushroom and cheese.

• Ready In: 2 hrs
• Serves: 6
• Yields: 1 pie

Ingredients

• For the crust

•  cooking spray
• 3⁄4 cup rolled oats
• 1⁄2 cup all-purpose flour
• 1⁄4 teaspoon salt
• 3  tablespoons unsalted butter, cold, cut into small pieces
• 3  tablespoons  cold low-fat buttermilk

• For the filling

• 4  teaspoons olive oil
• 1  large onion, sliced thinly into half moons
• 8  ounces  sliced  mixed mushrooms, such as cremini, oyster, shiitake
• 1⁄2 teaspoon salt
• 1⁄4 teaspoon fresh ground black pepper
• 1⁄4 teaspoon dry mustard
• 1  tablespoon  chopped fresh thyme leave (or 1 teaspoon dry)
• 3  large eggs
• 3  egg whites
• 1  cup fat-free evaporated milk (not condensed milk)
• 1⁄4 lb  slice of smoked low fat  smoked turkey (cubed)
• 2⁄3 cup  grated gruyere cheese (about 1-ounce)

Directions

1. Preheat the oven to 400 degrees F. Spray a 9-inch pie dish with cooking spray.
2. To prepare the crust, put the oats, flour and salt in the bowl of a food processor and pulse 3 times to combine. Add the butter and pulse about 12 times, until you get a pebbly course texture. Add the buttermilk and pulse 3 to 5 times more to combine. Form the mixture into a ball and place it between 2 large pieces of waxed paper. Roll out into a circle about 10 inches in diameter.
3. Remove the top sheet of waxed paper. Transfer the crust, still on the other piece of waxed paper to the pie dish, then remove the waxed paper from the top. Press the crust gently into the dish. Bake for 9 minutes, then let cool.
4. To prepare the filling, heat 2 teaspoons of oil in a large nonstick pan over a medium-low heat. Add the onion and cook, stirring occasionally, until golden brown and caramelized, about 20 minutes. Transfer the onions to a bowl. Add the remaining 2 teaspoons of oil to the pan and heat over a medium-high heat. Add the mushrooms and cook, stirring occasionally, until they have released their water and begin to brown, about 6 minutes. Add the onions back to the pan, stir in the salt, pepper, mustard and thyme.
5. In a medium bowl whisk together the eggs, egg whites and evaporated milk.
6. Sprinkle the cheese into the pie crust. Top with the mushroom-onion mixture, add cubed smoked turkey, and pour the egg mixture on top. Reduce oven temperature to 350 degrees F. Bake for 35 minutes or until knife inserted in the middle comes out clean. Let stand for 5 minutes before cutting into 6 wedges and serving.