Mushroom Tart with a Mashed Potato Crust

Reeni, who writes one of my favorite blogs, Cinnamon, Spice, & Everything Nice, was recently musing about how side dishes are worthy of more attention, and I completely agree!  Side dishes can be an afterthought and our regular rotation includes couscous, quinoa, brown rice, and sweet potatoes. How boring – it’s definitely time to mix things up! I brainstormed for a bit and finally decided to create a mushroom and cheese tart with a mashed potato crust.

Now I’m not one to normally use potato flakes, and have actually given my mom a really hard time about using them in the past, but I decided it would be important to be able to control the amount of the moisture in the pie crust, so I picked up a box. I mixed the flakes with water, butter, and salt, and then pushed them up the sides of a tart pan. Then I baked the crust until it was golden brown and filled it with layers mushrooms, garlic, leeks, and gruyere. I couldn’t resist topping it off with some crumbled goat cheese (surprise, surprise!). The tart was a hit and a lovely way to spice up our side dish rotation!

Mushroom Tart with a Mashed Potato Crust
Printable Recipe

4 cups mashed potato flakes
2 1/2 cups water
1/4 cup butter, melted
1 teaspoon salt
1 tablespoon olive oil
2 leeks, white and light green parts only, chopped
24 ounces mushrooms, roughly chopped
2 cloves garlic, minced
1 1/2 cups shredded gruyere cheese
4 ounces goat cheese, crumbled
1 teaspoon finely chopped fresh rosemary

Preheat oven to 350˚F. Mix potato flakes, water, butter, and 1/2 teaspoon salt in a large bowl until smooth. Press dough into a 10-inch greased tart pan with a removable bottom and bake at 350˚F for 40 to 45 minutes or until potato crust is golden brown and cooked through. Push down with the back of a spoon, if needed.

Meanwhile, heat olive oil over medium high heat in a very large nonstick skillet. Add leeks and mushrooms to the pan and sauté 7 to 10 minutes or until tender. Add garlic and sauté one additional minute. Stir in remaining 1/2 teaspoon salt.

Heat oven broiler. Place half the mushroom mixture in the cooked potato tart crust, followed by the gruyere cheese, and remaining half of the mushroom mixture. Top evenly with crumbled goat cheese and rosemary. Broil for 2 to 5 minutes or until cheese is melted and tart is warmed through. Makes 8 servings.

Nutrition: 255 calories, 17.0g fat, 2.4g fiber, 11.7g protein per serving
Cost: $1.52 per serving

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43 Responses to Mushroom Tart with a Mashed Potato Crust

  1. I love the idea of using potatoes as crust! Looks so delicious!

  2. Lauren says:

    Such a clever crust idea! I bet it tasted fantastic.

  3. This looks AMAZING :) I can’t wait to try it.

  4. Joanne says:

    I used to be all about the side dishes but now mine have gotten pretty boring as well. This, though, is anything BUT boring.

    My mom used to use potato flakes all the time. I don’t love them but I could definitely see how they would be useful here.

  5. megan says:

    I love the flavors you used and it’s so pretty. Well if that doesn’t dress up a dinner table, I don’t what will!

  6. L'Chicken says:

    I don’t know when the next mushroom council contest is, but this would place. I’m sure of it!

  7. candice says:

    I don’t like mashed potatoes with mashed potatoes flakes, but I’m sure they would be tasty in a crust! I think I like side dishes more than main dishes, actually. When I order in a restaurant, I generally focus on the side dishes that come with a meal first, and then decide if I’m willing to eat the main meal! ;)

  8. side dishes have the power to ruin a meal, or make it something special… you are right to pay more attention to them. Love the sound of this crust

  9. Mmm this looks so good! Plus the potato crust makes it gluten free – A+ in my book :) Love the creativity!

  10. elly says:

    I don’t think I could be any more in love with this recipe if I tried. Potatoes, mushrooms, leeks AND goat cheese? Drooooool.

  11. Shannon says:

    potato flakes! :) understandable why you’d want them, though! this looks absolutely scrumptious… fabulous.

  12. Reeni says:

    This puts my side dishes to shame Kerstin! This is incredible! I could eat just this for dinner and be perfectly happy and very satisfied. I love the mashed potato crust. I bet it would be good with other things – sometimes I don’t feel like making pastry. Thanks for the shout-out!

  13. Meghan says:

    A mashed potato tart crust?! So inventive! This looks fantastic! I am totally surprised you topped it with goat cheese ;)

  14. ingrid says:

    Like you Reeni has a lot of veryu creative and yummy dishes! Love the idea of a mash potato crust. I’ll be giving it a try!

  15. Pam says:

    Awesome! I am loving the mashed potato crust…what a fantastic and delicious looking tart. Nicely done.

  16. [...] Mushroom Tart with a Mashed Potato Crust – I generally do not like mushrooms, but this sounded so good, I would consider making [...]

  17. Melody Fury says:

    That’s gorgeous! Consider submitting it to out Battle Mushroom!

  18. grace says:

    although the filling isn’t particularly appealing to me, i’m absolutely smitten with the idea of using mashed taters as a crust! it’s brilliant, and a fine way for me to get my daily dose of potatoes. :)

  19. peachkins says:

    these looks sooo good!

  20. Erica says:

    I love the idea of the mashed potato crust!!! I have never been a big fan of mushrooms but I’m trying to love them

  21. Nicole, RD says:

    Glad you got the 18 Rabbits bar! Let me know what you think!

    As a lover or mushrooms (and boxed potatoes…guilty!), this sounds right up my alley! Thanks for the recipe!

  22. Cherine says:

    Great idea this potato crust!! Thanks for sharing :) Will def try it soon :)

  23. Liesl says:

    YUM! What a great idea, it looks delicious!

  24. Natashya says:

    I find some potato flakes in Indian recipes and was thinking of picking some up.
    Great idea to use them for the crust – looks delish!

  25. Maria says:

    I love the crust, great idea! And I am a huge mushroom fan!

  26. The potato crust with mushrooms sounds so good! And, I never get tired of goat cheese. Looks great on top!

  27. Monica H says:

    I am all over this and I think the mashed potato crust in ingenious. who knew?

    I think this could easily be served as a main course with a side salad or for brunch. mmm!

  28. What a gorgeous tart, I love the idea of mashed potato crust!

  29. Sophie says:

    What a georgous, fabulous & very inviting tarte!! I so love everything: the nice crust & so much the yummie & tasty looking filling!!

    A real feast for the eyes, Kerstin!

  30. Elina says:

    This was a side dish? I want to come over for dinner! lol
    Delicious :)

  31. Susan says:

    Just found your site – and what a pleasure! Not just great recipes, but also good info with them. Thanks for sharing.

  32. Juliana says:

    Great idea for using mashed potato as crust…to me, this is more like a main dish :-) Nice pictures Kerstin!

  33. Debbie says:

    I would be thrilled just with the crust alone!!! That looks heavenly!!!!

  34. Blond Duck says:

    This is a deliciously tasty treat! May I have some?

  35. Oh my gosh! I am going to try this for sure!

    *Check out the 2 great giveaways (yoga bag & beauty kit) going on @*

  36. sharon says:

    My project for the night is to find Valentine’s Day worthy recipes and this definitely fits the bill. Looks so lovely & impressive.

  37. Hey u rock babes,this is so fantastic a way to use flakes -i dont like mashed potato of flakes but yeah i do love using ‘em for a few more delicacies and this is so so fantastic …..but then u are fantastic in every creation

  38. CaSaundra says:

    I’ve actually never used mashed potato flakes in cooking, but if it makes something like this I should probably get some! :-)

  39. Another beauty!!!! I would love this. Reeni is right too. I could live on side dishes and appies.

  40. Kerstin says:

    Thanks everyone! It’s such an easy crust to make, compared to a traditional pie crust!

    L’Chicken – Aww thanks, that’s a huge compliment coming from you :)

    Reeni – Thanks for the inspiration!

    Meghan – Not predictable or anything :)

  41. Bo says:

    I have to admit I am sort of a food snob…I am very cautious of reicpes with potato flakes…but this one looks great!

  42. [...] pie featuring a mashed potato crust. This is definitely my kind of casserole! I’ve made this crust before in a tart pan and was really excited about whipping it up again and finally using up the remainder [...]

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