Butternut Squash and Goat Cheese Galette with Caramelized Onions and Crimini Mushrooms
Author: 
 
Pastry closely adapted from Deb Perelman; Filling inspired by Deb Perelman. Note that this recipe does require chilling time and start early. Also, you can cook the onions and mushrooms consecutively to save on cleaning a pan, but if you have 2 pans, it is easier and quicker to cook them simultaneously. Do whichever works better for you.
Ingredients
  • For the pastry:
  • 2½ cups (315 g) AP flour (I subbed in about ¾ cup white whole wheat flour), plus more for rolling
  • ½ t fine sea salt
  • 1 cup (16 T, 8 oz, 225 g) unsalted butter, cold
  • ½ cup (120 g) full fat sour cream or Greek yogurt (I used yogurt)
  • 1 T cider vinegar
  • ⅓ cup ice water, plus more if needed
  • 1 egg yolk plus 1 T water for brushing onto pastry
  • For the filling:
  • 1 medium-large butternut squash
  • 2-4 T extra virgin olive oil, divided
  • 1-2 t kosher salt, divided
  • freshly ground black pepper, approx. ½ t
  • 2 t minced fresh thyme
  • 10 oz goat cheese
  • 3 8-oz packages of crimini (Baby Bella) mushrooms
  • 1 T sherry
  • 2-3 T balsamic vinegar, divided
  • 3 medium onions, thinly sliced
Instructions
  1. First prepare the pastry dough, because it will need to chill.
  2. Whisk together the flour/s and salt in a large, sturdy bowl. Cube the cold butter and add it to the flour. Using your fingers or a pastry blender, break up the butter into the flour until the chunks of butter are no larger than a pea.
  3. In a separate bowl, whisk together the sour cream or yogurt, cider vinegar and ice water. Add it to the flour and use a silicone spatula to stir together. Dump it onto a clean work surface and fold or knead a few times (do NOT overwork) just to bring it together--I needed to sprinkle just a few extra drops of water to get it to come together as it was quite dry here when I made it.
  4. Wrap the dough in plastic wrap and place it into the fridge to chill for at least an hour or even overnight.
  5. About 90 minutes before dinner time, start preparing the filling. First preheat the oven to 400 F. Line a cookie sheet with foil.
  6. Slice the butternut squash lengthwise and scoop out the seeds. Place the 2 halves onto the cookie sheet and drizzle 1-2 tablespoons of olive oil over the squash. Sprinkle with fresh ground black pepper and coarse salt, about ½ teaspoon of each. Place in the oven to roast until fork-tender, about 45 minutes (start checking at 30 minutes, depending on the squash and the oven it could take less time).
  7. While the squash is cooking, slice the onions. Heat a skillet with a tablespoon of oil on medium high heat and add the onions with a pinch of salt. Toss occasionally.
  8. While keeping an eye on the onions, heat another skillet with a tablespoon of olive oil on medium high heat and add the mushrooms with a pinch of salt. Toss the mushrooms occasionally as well.
  9. In the meantime, remove the butternut squash when it is fork tender and let it cool a bit (you want it cool enough to handle). Leave the oven on 400 F.
  10. Reduce the heat on the onions and mushrooms both to medium or medium-low--you do not want to have to worry about them scorching while you multitask.
  11. Keeping an eye on your onions and mushrooms, tossing them occasionally, scoop the butternut squash out of its skin and add it to a large bowl or the bowl of a stand mixer. Add the goat cheese and thyme and beat until completely incorporated.
  12. When the mushrooms have released most of their water, add the sherry and stir, scraping any stuck bits from the pan.
  13. When the sherry has evaporated and the onions have caramelized to a rich brown (about 15 minutes), add a splash of balsamic vinegar with a pinch of salt to each pan, about a tablespoon or a little over that. No need to use a fancy balsamic here. Use the vinegar in both pans to deglaze and scrape up the bottom of the pan. Let the liquid mostly cook off and then turn off the heat for both pans.
  14. Add the onions to the squash-goat cheese mixture, and mix in. Taste for salt and pepper, and add what is needed. Set aside.
  15. Now it is time to roll out the pastry.
  16. This pastry was wonderful to work with. Place a silicone mat or parchment paper on your clean work space. Dust it and the counter around it with flour, and place the unwrapped pastry dough in the middle. Dust a little more flour on top of it. I used my hands first to pat it down into a circle, and then I used a straight wooden rolling pin to roll it into a circle (of sorts!) of about 16 inches in diameter. The pastry may go off the edges of the parchment or silicone and that is ok. Use the silicone or parchment to slide the pastry onto a rimless baking sheet.
  17. Scrape the squash-goat cheese-onion mixture onto the center and pat it out to about 2-3 inches from the edge of the pastry.
  18. Dump the mushrooms on top of this and spread them to about 2-3 inches from the edges as well.
  19. Fold the 2-3 inch pastry border over the filling, pleating it as you go to make it all fold over (when you fold the edges over, the entire thing should fit within the edges of the baking sheet) . The center will be open, and this is a dish that should not look perfect (hooray!) so rustic and slightly uneven is ok.
  20. Quickly whisk the egg yolk and tablespoon of water together. Use a pastry brush to brush it onto the top of the pastry dough.
  21. Bake for 30-40 minutes, until the filling it hot and the crust is golden brown (if your oven bakes unevenly, rotate the pan halfway through). Let the galette stand for 5 minutes on the baking sheet before transferring it to a cutting board by sliding it off of the pan. Slice into wedges and serve warm.
  22. *I reheated this galette the next night in a 300 F oven for about 40 minutes, as I did not want to risk the crust getting soggy in the microwave.
Recipe by The Spiced Life at https://www.thespicedlife.com/butternut-squash-and-goat-cheese-galette-with-caramelized-onions-and-crimini-mushrooms/