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Preheat oven to 375 degrees.
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Brush bottom and sides of pie pan with canola oil. Take one pie crust from refrigerator and make sure it is soft and pliable. Gently mold pie crust into pie pan and up the sides. You will also use the second pie crust (keep in refrigerator until ready to use), so take your time and work slowly, careful not to stretch the crust too thin. When you are ready to use the second crust, remove it from the refrigerator and fill the rest of the pie pan and remainder of the sides.
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Trim any excess crust and brush bottom and inner sides of crust with one beaten egg white. Bake for 8 minutes until light brown. Remove from oven and set aside.
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While crust is baking and cooling, microwave frozen spinach. Remove spinach from packages and place in microwave safe bowl. Cover with a half cup of water and a paper towel and microwave on high heat for 8 minutes. You may need to cook for a few additional minutes if necessary. Remove from microwave and thoroughly squeeze out excess water. Be extremely thorough in getting out as much water as you can.
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Place spinach in a medium mixing bowl and add cream cheese, egg, salt, pepper and garlic powder and combine with hands.
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Place mixture in pie crust and smooth with spatula. Take remaining thawed pie crusts and repeat process to cover the top of the pie thoroughly with the crusts. Crimp the edges using fingers or with a fork.
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Cut 8 - 10 slits in the crust with a knife and brush the crust with the remaining egg white. Generously sprinkle the top of the crust with the poppy seeds (you can use more or less, depending upon your taste--I literally cover the top of my crust with them).
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Bake for 45 minutes to 1 hour, until pie is very brown on top.