EASY GRUYERE, MUSHROOM, & CARAMELIZED ONION BITES

 I’ve been wanting to get these puff pastry bites for A. LONG. TIME. They’re perfect for holiday parties and they look oh so, elegant. So elegant that you have the guests fooled on how long it actually took to make these bad boys. When you’ve got a holiday part going on, the last thing you want to do is spend too much time on any one dish. Not gonna do it. You’ve gotta simplify and do some do-ahead work. And these caramelized onion bites fit right into that agenda.
 Let’s talk about the recipe. I’m using 2 medium yellow onions and about 5-6 ounces of crimini mushrooms. A little sugar, a little balsamic vinegar, and a 1/4 teaspoon of thyme.


We’re going to start by sautéing the mushrooms in a few tablespoons of oil for 4-5 minutes. Once they start to brown, remove them to a bowl. Add the remaining butter and the onions. Let them hangout in the pan for 5 minutes. Remember to use a cast iron or stainless steel skillet. You want to avoid using a nonstick skillet as the onions won’t caramelize as well. After the 5 minutes, toss in the sugar and thyme. Now crank the heat down to about medium-low and cook for a total of 25 minutes and keep checking on them every 5 minutes or so to make sure they aren’t caramelizing to fast. Add the balsamic to help deglaze the pan and when it’s all been soaked up, you’re done. Add the onions to the mushrooms and season with a little garlic powder + salt and pepper.

 Let your filling come to room temperature, you can store it in an air tight container for up to 48 hours in the refrigerator. If you decide to make the filling ahead of time, zap it in the microwave to bring it back to room temp before continuing with the recipe instructions. Mix in the gruyere cheese and combine well.

EASY GRUYERE, MUSHROOM, & CARAMELIZED ONION BITES
These are delicious!!! I wanted to make them ahead of time so I made the filling and cooled it to room temperature as you suggest.

Prep Time: 10 mins
Cook Time: 45 mins
Total Time: 55 mins

Ingredients:

•     4 tablespoons salted butter, divided
•     1/4 teaspoon dried thyme
•     5-6 ounces crimini or button mushrooms, sliced
•     2 medium yellow onions, thinly sliced
•     1 1/2 tablespoon balsamic vinegar
•     1 tablespoon sugar
•     2 tablespoons vegetable oil, divided
•     1/4 teaspoon garlic powder
•     salt and pepper, to taste
•     1 package (1 pound) frozen puff pastry, thawed
•     4 ounces grated gruyere cheese (I used applewood smoked gruyere)
•     1 egg, lightly beaten

Directions:

1. In a large cast iron skillet over medium heat, heat 1 tablespoon of oil along with 1 tablespoon of butter. Add the mushrooms and sauté for about 5 minutes until tender. Remove and set aside in a medium bowl.
2. Heat the remaining 3 tablespoons of butter along with the 1 tablespoon of oil and sauté the onions for 5 minutes. Add the dried thyme and sugar and continue to cook for 25 minutes on medium low heat. Make sure to stir the mixture every 5 minutes or so. If the onions are caramelizing too fast, turn down the heat a little more. Add the balsamic vinegar to deglaze the pan, allow the onions to soak it all in. Turn off heat. Add the onions to the mushroom mixture. Season with the garlic powder and salt and pepper to taste, stir to combine. Allow to cool to room temperature. Mixture can be kept in an air-tight container and refrigerated for up to 48 hours at this point. Allow to come to room temperature before proceeding. Add the gruyere cheese and mix well.
3. Position two racks in the upper and lower thirds of the oven. Preheat the oven to 400 degrees F. Line 2 baking sheets with parchment paper or silicone mats.
4. Using a knife or a pizza cutter, cut the puff pastry into 2-inch squares and place them on a lined baking sheet. Make sure the puff pastry is cold before proceeding. If not, allow it to rest in the refrigerator for 10-15 minutes before proceeding. Using a pastry brush, brush the beaten egg on the squares. Place a tablespoon of caramelized onion mixture in the center. Bake for 20-25 minutes, rotating the pan halfway in between until crisp and golden brown. Let cool slightly before serving.

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