caramelized onion quiche

Ingredients:
2 Tbsp olive oil
2.5 cups thinly sliced yellow onions
3/4 cup heavy cream
3/4 cup milk
3 large eggs
1/2 tsp salt
1/4 tsp pepper
1 1/4 cup provolone cheese, divided
1 9 inch pie crust (I make the whole recipe and freeze half)

Preheat the oven to 350 F.

Heat the oil over medium heat. Add the onions, and saute until golden and very soft, about 15 minutes. Remove the onions from the pan with a slotted spoon and set aside. Whisk the heavy cream, milk, eggs, salt and pepper. Stir the onions and 1 cup of the cheese into the egg mixture. Pour the egg mixture into the pie crust. Sprinkle the remaining cheese evenly over the top of the quiche. Set the quiche pan on a baking sheet and bake until a knife blade inserted into the middle of the quiche comes out clean (about 40-45 minutes). Cover the edges of the crust with foil if it gets too brown. Remove the quiche from the oven and cool on a wire rack. Let cool for 20 minutes before slicing.