Preheat the oven to 375 degrees F. Roll out one disc of pie dough into a circle, 12 inches in diameter. Place in 9 inch pie dish and crimp edges.
Blind bake crust: Place a piece of parchment paper inside the pie pan and add 2 cups of pie weights, dry beans or rice. Bake at 375 degrees F for 15 minutes. Remove parchment paper and pie weights. Prick pie crust all over with a fork, then return to the oven for 8 more minutes.
Meanwhile, cook bacon, in a skillet. Once cooked, remove to a plate and chop. Remove most of the grease from the pan and add onion and spinach. Saute for 2 minutes. Add cheese, onion, spinach, and bacon to the bottom of the partially baked pie crust.
Combine the eggs, half and half, salt, and pepper in a blender, then pour the egg mixture into the pie.
Reduce oven temperature to 350 degrees. Bake quiche for 40- 45 minutes until the egg mixture is set. Allow to cool for 10 minutes, or even to room temperature, before slicing. Store leftovers, covered, in the fridge.
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Notes
Make ahead Instructions: Make the recipe through step 2. Blend the egg mixture and store the pie and egg mixture separately for up to 2 days (depending on the freshness of your eggs). Add egg mixture to the pie and bake as instructed.Freezing Instructions: Allow it to cool completely then cover well and freeze for up to 2 months. To reheat, allow the quiche to thaw in the fridge overnight (if frozen) and bake at 350 degrees for 20-30 minutes or until warmed through.