Delicious Gruyere Mushroom & Caramelized Onion bites

Caramelized onion bites with sautéed crimini mushrooms, balsamic caramelized onions, and applewood smoked gruyere cheese. Thee best little appetizers! They’re made with puff pastry and take no time in any respect to whip up! these are the appropriate appetizers to serve your guests this excursion season.

Ingredients

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

Guidelines:

1. In a big solid iron skillet over medium warmness, heat 1 tablespoon of oil together with 1 tablespoon of butter. add the mushrooms and sauté for approximately 5 minutes until tender. dispose of and set apart in a medium bowl.
2. warmness the ultimate 3 tablespoons of butter along with the 1 tablespoon of oil and sauté the onions for five mins. add the dried thyme and sugar and continue to cook for 25 mins on medium low warmness. ensure to stir the aggregate every 5 mins or so. If the onions are caramelizing too speedy, turn down the warmth a little extra. upload the balsamic vinegar to deglaze the pan, permit the onions to soak it all in. turn off heat. upload the onions to the mushroom combination. Season with the garlic powder and salt and pepper to flavor, stir to mix. allow to cool to room temperature. mixture can be kept in an air-tight field and refrigerated for as much as forty eight hours at this point. permit to come back to room temperature earlier than intending. upload the gruyere cheese and mix nicely.
3. position  racks within the top and decrease thirds of the oven. Preheat the oven to four hundred levels F. Line 2 baking sheets with parchment paper or silicone mats.
4. the usage of a knife or a pizza cutter, reduce the puff pastry into 2-inch squares and region them on a coated baking sheet. ensure the puff pastry is bloodless earlier than intending. If now not, allow it to rest in the refrigerator for 10-15 mins before intending. using a pastry brush, brush the overwhelmed egg on the squares. area a tablespoon of caramelized onion mixture within the middle. Bake for 20-25 mins, rotating the pan halfway in between until crisp and golden brown. allow cool barely earlier than serving.

Notes:

1. make sure the puff pastry is bloodless while it goes into the oven. If at any point it becomes soft, permit it to relaxation in the refrigerator for 15-20 minutes or till it corporations up once more. Do now not open the oven door for the duration of the first 10 mins of baking time. regularly establishing the oven may additionally cause the puff pastry to no longer ‘blow his own trumpet’.
2. Mozzarella or gouda cheese can be used to replace the gruyere. I sincerely just like the smoky flavor of applewood smoked gruyere with those bites.
3. in case you’ve prepared the caramelized onion mixture in advance of time, you can zap it in the microwave for 30 seconds to convey it returned to room temperature fast.

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