Preheat the oven to 375℉ and spray a tart pan or pie pan with olive oil spray then set aside.
In a large pan melt the butter and saute the onion until soft, then add the broccoli and cook for a couple minutes until tender.
Remove from heat and add to the baking dish, making sure to create an even layer. Set aside to cool.
In a large bowl whisk the eggs with the salt and black pepper until well combined.
Pour in the heavy cream and half & half and whisk until well combined, then mix in the cheese and stir until well combined.
Pour the egg mixture over the broccoli in the baking dish. Bake in center of oven for 35 to 40 minutes.
After the 35 minutes insert a toothpick or knife into the center of the quiche to test for doneness. When finished cooking, the eggs should be set and the top be browned. IMPORTANT: If you don’t want the top of the quiche to brown you should cover it lightly with aluminum foil once the eggs are mostly set, after about 25 minutes of baking.
Once cooked through, remove from oven an allow to cool for a few minutes before serving.
Serve as a breakfast, brunch or light lunch. Enjoy!
Notes
You can make this quiche ahead of time and reheat it for a few minutes in a warm oven.