Roll pastry into a 24 cm (9 1/2”) fluted pie dish.
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While preheating the oven to 400°F, sauté onion and mushrooms until tender.
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Meanwhile grate the cheese, place it in the pie shell, and sprinkle with salt/pepper/garlic powder to taste.
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Put the sautéed onion and mushroom (and optional ingredients - see below) on top of the cheese.
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Beat the eggs and milk together.
Pour egg/milk mixture onto the pie.
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Bake 20 minutes at 400°F.
Reduce heat to 350°F and bake another 30 minutes until golden and set.
It should be firm to the touch in the centre when done.
Let sit 10 minutes before serving.
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Serve with Caesar salad or baked beans & fried potatoes.
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Optional Ingredient Variations:
-chopped spinach
-replace 100g of the grated cheddar/Swiss mix with 100g of crumbled feta cheese
-chopped cooked ham
-cooked bacon, crumbled
-cooked broccoli