For the egg custard:
In a large bowl, whisk eggs, heavy cream and salt. Set aside 1 tablespoon of the mixture in a bowl.
Preheat oven to 375 degrees F
For the crust:
Combine the flour and salt in the bowl of a food processor. Pulse to combine. Blend the ice water and extra virgin olive oil together well. Pour into food processor and pulse a few more times until the mixture comes together. On a floured surface, roll out the dough and fit into a 9 inch pie or quiche pan.
Layer the quiche crust first with chopped spinach, then sauteed onion, crisp bacon, then grated guyere cheese. Pour egg mixture over the top. Add Cayenne Chili olive oil to the reserved egg mixture. Brush over crust. The Cayenne will give a touch of spice.
Place quiche in preheated oven. Bake for 35-40 minutes, until crust is browned and egg is set in center. Allow to cool before serving. Also delicious served at room temperature with a side salad.