Mushroom Leek Quiche

Quiche is a fancy tart, with a buttery crust and a rich creamy filling. Mushrooms and leeks make this recipe an extraordinary one, full of flavor and a wonderful dish to have frozen at all times!

Originally published in 2012, it has been updated with images, text, and recipe to serve you better.

I'm very used to making quiche, or thin tarts, and this mushroom leek version is one of my favorites. Who doesn't like mushrooms and homemade pastry, right?

I added leeks to the mix.

Why? Because they really go perfect together. Flavors that pair well, these are two that get the job done.

The thing about quiche is pretty much like frittata or risotto: it's the perfect way to clean your fridge of odds and ends. Vegetables and cheeses, deli meats, anything and everything can go into a quiche.

What is quiche?

Quiche is a French word for tart, which is different from a pie in it's height mostly.

It has 3 main components: crust, binding cream, and add-ins.

The crust.

An all-butter quiche pastry is best and homemade is highly recommended. The French pate sablée is the most common one.

My go-to quiche dough has only four ingredients, flour, salt, butter, and ice water (image below). 

I know it as Shortcrust Pastry (or Pie Crust) and there's a whole post devoted to it.

The binding cream.

This is essentially the glue that makes it all come together.

Traditional recipes for this part have lots of cream and many times include grated cheese.

I have streamlined it and now have the best recipe which involves natural yogurt. Only 5 ingredients including salt and pepper (image above).

And no cheese. I use it in the add-ins if it's part of the filling - which in this mushroom leek quiche is not.

The binding cream is added after the add-ins (image below).

The add-ins.

The filling is simple and I never follow quantities. But for the sake of this recipe, I did, of course.

I use mushrooms and leeks because they are awesome together. But you can use green onions or shallots and the results will also be great.

How to cook the vegetables.

In the oven: my favorite way and how I cooked them for this recipe (image above). Drizzled with some olive oil in a baking pan until they are softened but still crunchy. This is important because they will continue cooking in the oven once the quiche is assembled.

On the stove: I just melt butter and some olive oil, and throw in coarsely chopped leeks, add salt and pepper, cook for a minute or so, then add chopped mushrooms, turn on the heat to high and it's done when the mushrooms are brown and no liquid remains.

It is very important not to use watery ingredients when making quiche, as the result will be soggy. And soggy is no good. Nobody likes a soggy tart.

Quiche is the perfect thing for a lunch together with a salad, for a picnic, for a buffet table and, if you make them bite-size, it's the ultimate appetizer to eat while you mingle holding a cocktail in your other hand.

So this is one of my favorite foods for New Year's eve parties. Because it is amazing at room temperature as finger food!

Let me know if you make this recipe! I’d love to hear what you think about it.
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Yield: 8-10 servings

Mushroom Leek Quiche

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Quiche is a fancy tart, with a buttery crust and a rich creamy filling. Mushrooms and leeks make this recipe an extraordinary one, full of flavor and a wonderful dish to have frozen at all times!

The filling in this recipe is for a 9-inch square or round pan with removable bottom. But you might have leftover pie crust.

Prep Time 30 minutes

Cook Time 35 minutes

Total Time 1 hour 5 minutes

Ingredients

• This recipe is for 9-inch square or round pan with removable bottom
• Shortcrust Pastry (or Pie Crust) . Or use a commercial pie crust, all-butter is better.

For the filling:

• 14oz (400g) portobello mushrooms, sliced
• 2 large leeks, white and light green parts only (about 2 cups sliced)
• Salt and black pepper

For the binding cream:

• ¾ cup (190g) natural yogurt (or Greek)
• ¾ cup (190g) whipping cream 
• 3 eggs, room t°
• Salt and pepper, to taste

Instructions

For the crust:

1. Make shortcrust pastry according to the recipe in the post linked above.
2. Blind bake (pre-baking) according to instructions in the link above, and reserve. Leave the oven on.

For the filling:

1. Preheat the oven to 350°F /180°C.
2. Wash, dry, and thinly slice leeks. Clean and slice whole mushrooms.
3. Put them in a lightly oiled baking pan and bake for about 15 minutes, until beginning to soften. You do not want to completely bake them at this point.

For the binding cream:

1. In a large bowl mix cream and yogurt until combined with a wire whisk or spoon. No need to use an electric mixer.
2. Add eggs and mix until well combined but without beating. We don't want to beat the eggs much, only combine them well.
3. Add salt and pepper and mix. I suggest you taste it and adjust seasonings. It should be somewhat salty. Remember the mushrooms and leeks are cooked without salt.

To assemble the quiche:

1. It's best to fill the quiche dough near the oven.
2. Scatter the mushrooms and leeks at the bottom.
3. Slowly add the cream covering the whole surface. Don't overflow the walls of the quiche, but they will fill completely.
4. Bake for 35-40 minutes, until puffed and golden.
5. Let cool on a wire rack for a few minutes and eat.
6. Or eat at room temperature.

Notes

Make-ahead:

Let cool completely on a wire rack after taking the quiche out of the oven. Wrap in plastic and refrigerate for 2-3 days. Or freeze, well wrapped, for a month.

Serving:

Choose to serve it hot, straight from the oven or at room t° as finger food. It travels well for picnics and is amazing as part of a brunch table.

Paula Montenegro

I'm Paula, a baker for more than 30 years and your designated recipe finder, sharing the best ones on this blog, with simple ingredients + easy-to-follow instructions.