Saute chopped onion in butter till soft and golden. Add your chopped veggies to the pan after about 3 min to soften and cook the rest of the way with the onion. Add a pinch or two of salt.
In a mixing bowl, whisk together eggs and cream. Add a half tsp salt, 1/8 tsp pepper, grated cheese, your sauteed veggies and any chopped meat you might want to add like bacon or ham to the bowl and mix.
Divide evenly into two pie shells.
Bake at 375 F until the center of the quiche is set (about 40-45 min)
Remove from oven and let sit on the counter for 10 min before serving.
Notes
Filling can be frozen for a year. You can use any pie crust that you like. I have done it with homemade pie crust like my Flaky Butter Pie crust, store bought frozen, and gluten free pie crust and it always comes out delicious!