Preheat the oven to 400 degrees F. Spray a 9-inch pie dish with cooking spray.
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.
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.
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.
In a medium bowl whisk together the eggs, egg whites and evaporated milk.
Sprinkle the cheese into the pie crust. Top with the mushroom-onion mixture 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.
Nutritional analysis per serving (Serving size: 1 wedge)
Calories 270; Total Fat 14 g; (Sat Fat 6 g, Mono Fat 5 g, Poly Fat 1 g) ; Protein 14 g; Carb 24 g; Fiber 2 g; Cholesterol 125 mg; Sodium 430 mg
Excellent source of: Protein, Riboflavin, Phosphorus, Selenium
Good source of: Vitamin A, Niacin, Vitamin D, Pantothenic Acid, Calcium, Iodine, Iron, Potassium

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Nutrition Facts

Per Serving Per 100 g

Amount Per 1 Serving
Calories	363.89 Kcal (1524 kJ)
Calories from fat	152.96 Kcal
		% Daily Value*
Total Fat	17g	26%
Cholesterol	113.77mg	38%
Sodium	663.1mg	28%
Potassium	233.93mg	5%
Total Carbs	40.34g	13%
Sugars	13.69g	55%
Dietary Fiber	2.78g	11%
Protein	13.64g	27%
Vitamin C	2.1mg	3%
Vitamin A	0.1mg	2%
Iron	2.1mg	11%
Calcium	210.5mg	21%

Amount Per 100 g
Calories	175.18 Kcal (733 kJ)
Calories from fat	73.64 Kcal
		% Daily Value*
Total Fat	8.18g	26%
Cholesterol	54.77mg	38%
Sodium	319.23mg	28%
Potassium	112.62mg	5%
Total Carbs	19.42g	13%
Sugars	6.59g	55%
Dietary Fiber	1.34g	11%
Protein	6.57g	27%
Vitamin C	1mg	3%
Iron	1mg	11%
Calcium	101.4mg	21%

* Percent Daily Values are based on a 2000 calorie diet. Your daily values may be higher or lower depending on your calorie needs.
Find out how many calories should you eat.

Tastes

salty
savory
bitter
sweet

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