Prepare the Pie Crust

1. Preheat your oven to 400 degrees.
2. Remove the packaging from the pie dough, and place it into a pie dish. Using a fork, prick the pie dough 7 to 8 times. (This will prevent your dough from bubbling up).
3. Bake the dough for 5-10 minutes, allowing the dough to thaw, but not cooking all the way through. 
4. Remove the pie dough from the oven and let cool on a heat-safe surface.
5. Lower the oven temperature to 350 degrees.

Create Quiche Filling

1. In a large frying pan, pour in your olive oil. Add your onions and sauté until fragrant and tender.
2. Add your frozen spinach, and sauté with your onions until heated and no water is in your pan. Set the pan aside to cool.

Prepare Eggs

1. In a large mixing bowl, add your eggs and beat well with an electric mixer or whisk.
2. Add your whole milk and continue to beat until well combined. Add your salt and nutmeg.
3. Mix one more time to ensure all ingredients are thoroughly combined.

Assemble Quiche

1. In your cooled pie crust, sprinkle your Swiss cheese at the bottom of the pie crust.
2. Add your spinach and onion mixture on top of your Swiss cheese.
3. Pour your egg mixture on top of the Spinach and Swiss cheese.

Bake

1. Place a heat-safe pan in your oven in case of spills. Place your quiche on top of the pan.
2. Bake for 1 hour or until a toothpick comes out clean when checking the middle.
3. Cool for 5 to 10 minutes before slicing.