What I love about Caramelized Onion and Mushroom Quiche
This Caramelized Onion and Mushroom Quiche has become one of my absolute favourite dishes to meal prep for the week. For starters, it’s hearty, wholesome, and packed with rich, satisfying flavour. From the sweet, slow-cooked onions and earthy shiitake mushrooms to the nutty Emmental cheese and fragrant fresh thyme, every bite is beautifully balanced.
Really though, I truly love a good quiche—not just for breakfast, but also as a quick, easy lunch or even a mid-afternoon snack when hunger hits early. Thanks to its high protein content, it’s incredibly filling and helps keep you satisfied throughout the day.
Even better, this quiche makes 8 generous slices, so you’ll have a nutritious, delicious option ready to go all week long. Whether you’re planning ahead or just want something you can grab and reheat, this recipe is a total win.
What you will need to make Caramelized Onion and Mushroom Quiche
Here’s a list of ingredients that you will need:
- High-quality eggs – First of all, try to find organic pasture-raised eggs for the richest yolks and best health benefits. You will need 8 eggs for this quiche
- Onion – Next, you can use yellow onion, white onion or even shallots for this recipe. All will work.
- Mushrooms – Additionally, you will need some shiitake mushrooms for this recipe. I try to avoid white and brown mushrooms, which are lacking in flavour, and go for something more unique or some type of a chef’s blend.
- Prepared quiche crust – Moreover, you can use any quiche crust that you like or even make it crustless!
- Heavy cream – I like to use cream instead of milk in quiches to make them more rich and flavour.
- Thyme – Do use fresh thyme if you can. The flavour is so delicious with the mushrooms and onions. Dried thyme could work in a pinch but I always use fresh!
- Emmental cheese – Finally, Emmental, a delicious and authentic Swiss cheese, makes this quiche what it is! You can find it in the specialty cheese section at most grocery stores.
Caramelized Onion and Mushroom Quiche
Equipment
- 1 9" Pie or Tart Dish
Ingredients
- 4 tbsp unsalted butter for cooking
- 1 white onion thinly sliced
- 3 cups shiitake mushrooms thinly sliced
- 1 9" prepared quiche crust (or 9" pie dish for crustless)
- 8 organic free-range eggs
- 1/2 cup organic heavy cream
- 5-7 sprigs fresh thyme (leaves removed)
- 2 tsp sea salt
- 1 tsp black pepper
- 3/4 cup shredded Swiss Emmental cheese
Instructions
- Preheat the oven to 400F.
- Heat a cast iron pan or skillet over low-medium heat and add the butter.
- Once the butter has started to melt, add the sliced onions and mushrooms and sauté until the onions are caramelized and the mushrooms are browned.
- In a medium-sized bowl, add the eggs, cream, thyme, salt and pepper and whisk until smooth. Add the cheese and whisk in to mix.
- *Add the mushrooms and onions to the bottom of the quiche crust (or pie dish for crustless) and then pour the egg mixture over top.
- Bake for 20-23 minutes or until golden brown on top and no longer jiggling. Let cool before cutting into slices.
- Enjoy!
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