This satisfying quiche features a medley of tender mushrooms and onions slowly caramelized to perfection. A creamy egg custard and your favorite cheese complete this delicious and simple dish.
In a large skillet, melt the butter over medium heat.
Add the onions and cook for 10-15 minutes, stirring occasionally, until golden and softened.
Stir in the mushrooms, thyme, season with a pinch of salt, and cook until softened, approximately 4-5 minutes.
Remove from the heat. Allow to cool to room temperature.
Preheat oven to 425˚F.
Roll out the crust and gently press into a pie plate or 9 inch spring form pan. Weigh down the center with pie weights or line with parchment and fill with dry beans.
Bake the crust for 10 minutes. Remove the pie weight or beans. Cool to room temperature.
In a medium bowl, whisk together the eggs, half and half, salt and pepper. Set aside.
Top the crust with 3/4 cup of the shredded cheese. Top the cheese with the onion and mushrooms in an even layer.
Pour the egg mixture into the crust and sprinkle with the remaining cheese.
Reduce the oven temperature to 350 degrees and bake for approximately 40 minutes or until the quiche is golden brown and puffed.