Would you LOOK at all those mushrooms? If you're a mushroom lover (like me), you're going to simply love this small savory tart. Loaded with mushrooms and gruyere cheese, this Puff PastryMushroom Gruyere Tart is perfect for entertaining and tastes amazing!
Thaw puff pastry in the refrigerator according to package directions.
Preheat oven to 400 degrees.
Lightly dust some flour on a large sheet of parchment paper.
Unroll one pastry sheet and place it on top of a lightly floured surface.
Using a knife or pizza cutter, gently serrate about ½ inch all the way around the edge of the pastry.
Sprinkle one heaping cup of shredded Gruyere cheese in the center while leaving the border clean.
Wipe mushrooms clean. Heat olive oil and butter in a frying pan on medium heat. Season and saute mushrooms until softened for approximately 6-8 minutes. Drain liquid.
Spread mushrooms on top of cheese.
Transfer pastry to a baking sheet and bake for 15 minutes. Using a pastry brush, lightly brush egg wash over the border and then continue baking for another 5-10min.
Remove from the oven and top with thyme (if desired). Cut into 4 pieces and serve warm. Mushrooms will get darker in color as it cools.