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Mushroom and Caramelized Onion Tart topped with spinach
5 from 1 vote

Mushroom and Caramelized Onion Tart

A flakey puff pastry topped with balsamic caramelized onions, sautéed garlicky mushrooms, and topped with whatever you like!
Prep Time15 mins
Cook Time20 mins
Servings: 9 pieces
Author: Shweta


  • 1 puff pastry sheet
  • 2 tablespoon olive oil
  • 1 red onion, thinly sliced
  • 1 cup crimini mushrooms, chopped
  • 2 tablespoon balsamic vinegar
  • 3 cloves garlic, diced
  • salt, to taste
  • black pepper, to taste


  • Pre-heat oven to 400°F.
  • Thaw puff pastry according to package instructions.
  • In a small pan, heat 1 tablespoon of olive oil on medium-low heat. Add the onions and cook them for about 15-20 minutes until they begin to caramelize.
  • Add the second tablespoon of oil and saute the mushrooms until they begin to soften.
  • Add the garlic, salt, and pepper. Saute for about 1 minute then add the balsamic vinegar. Cook until the liquid evaporates. Remove from heat.
  • Unfold thawed puff pastry and score the perimeter of the puff pastry sheet about ¼ inch from the edge (score just means to make a slit in the puff pastry but don’t cut it all the way through).
  • Spread onion and mushroom mixture onto the puff pastry sheet staying within the scored edges.
  • Bake for about 15-20 minutes or until the puff pastry is browned.
  • Once baked, cut into 9 pieces and top with chopped spinach, parsley, or even cheese crumbles!