caramelized onion and mushroom quiche
quiche is one of my favorite foods for breakfast, lunch, or dinner. it’s the perfect food in my opinion; eggs for protein, usually a veggie or two, the creamy cheese and flaky crust just compliment each other so well. my family does not agree. emmett (2 year old) won’t touch an egg, and ryan (husband) says “he’s not a quiche guy.” they had frozen pizza for dinner. whatever, more for me. traditionally my mom makes quiche and creamed chipped beef for breakfast on christmas morning. we’ll leave the chipped beef for another time, but coming up on christmas i had to get my quiche fix since we won’t be spending it in maryland. this is my mom’s recipe with my fillings. hope you enjoy, let me know in the comments! 🙂
1 cup all purpose flour
1 stick of cold unsalted butter
4 oz cold cream cheese
1 medium sized sweet onion
8 oz white button or baby bella mushrooms
5 large eggs
2 tbsp butter (separated)
2 tbsp olive oil (separated)
1/2 cup milk – 2 percent or whole
1/2 cup mayonnaise
4-6 oz grated cheese of choice – i used a shredded blend i already had but this would be amazing with fontina or gruyere as well
1 teaspoon fresh thyme leaves
1 pinch of salt
1/4 tsp black pepper
1/2 tsp ground mustard
the crust is the easiest part and can be made ahead of time and even frozen if needed. cut up one stick of cold, unsalted butter into small pieces and add to a medium sized bowl along with the flour and cold cream cheese. the cream cheese should also be cut into pieces. work the mixture together with your hands until everything is completely combined and comes together into a ball of dough. form it into a disc, wrap in plastic wrap, and refrigerate until cold. i ended up sticking mine in the freezer for a few minutes because i didn’t make it far enough in advance, and that’s fine too.
the oven will need to be preheated to 375 degrees, but you can do this at any point since the onions and mushrooms will take a little while, and can be made in advance. i did my onions in the morning, and then had to do naptime with kiddos before finishing the rest :). the first step of the filling is caramelizing the onions, which can take around 20-25 minutes. peel and thinly slice the onion, then heat a skillet or dutch oven to low heat, and add one tablespoon of the butter and one tablespoon of olive oil. cook the onions over low heat, stirring frequently for about 20-25 minutes until they are a deep golden brown and almost falling apart. as the onions are cooking you can go ahead and slice up the mushrooms. set the onions aside and add the second tablespoon of butter and olive oil to the pan and sauté the mushrooms over medium heat until they have released most of their liquid, about 7-8 minutes. add the thyme to the mushrooms and cook for about 2 more minutes.
whisk together the eggs, milk, mayonnaise, pinch of salt, pepper, and ground mustard. then fold in the onions, mushrooms and cheese.
lightly flour a clean surface and roll out the pie crust, then place it into a pie plate or oven safe pan. do whatever your heart desires with the edges of the crust. i’m obviously not talented with pie crusts as you can tell by my rustic style… this crust is really forgiving and if it rips you can just mush it back together. then pour the quiche mixture into the crust, cover with foil and bake for 45 minutes. remove the foil and bake for 15-20 more minutes, until it is just set. let the quiche cool for at least10 minutes, then slice and serve!