A savory crustless quiche with ground beef, mushrooms, Swiss cheese, spinach, and a rich egg custard.
Do not overcook the ground beef. I made the mistake of letting the ground beef sit in the skillet a touch too long the first time making this mushroom swiss quiche. It dried it out when baking. Another time I cooked the beef until only brown on the outside but still pink in the center, it was still pink when the baking was complete. So make sure to cook your beef just right. Make sure it is browned and then pull it off and drain immediately and set aside.
A quiche is done when the egg mixture is set but slightly wobbly in the center.Don’t overcook the quiche or you can lose the smooth creamy texture you want out of a quiche. The edges and around the center will be set but the middle should still have a slight movement to it.
You can cook this in two separate 9 inch pie pans.If you prefer a round, pie shaped quiche, you can use two pie pans. Or you can easily half this recipe and make it in just one pie pan instead.