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Caramelized Onion Tart with Gruyère Cheese

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Recipe, video and photography provided by Heinen’s partner, Chef Billy Parisi.

Take a timesaving shortcut by using a puff pastry sheet and this onion tart will come together with ease! Rich caramelized onions, Gruyère and a buttery puff pastry create a mix of savory and sweet perfect for any season.

Why You’ll Love This Recipe

  • You can serve this tart as an appetizer, light lunch or an addition to a dinner spread.
  • Local, greenhouse-grown Thyme works as an ingredient and a garnish to emphasize the savory flavor of roasted onions.
  • The combinations are endless. Think about customizing this recipe by adding bacon, mushrooms or tomatoes!
Caramelized Onion Tart with Gruyère Cheese

Caramelized Onion Tart with Gruyère Cheese


  • 2 tsp. all-purpose flour
  • 1 sheet puff pastry (frozen and thawed)
  • 1 cup shredded Gruyère cheese
  • 3 tsp. chopped fresh thyme
  • 1 large or 2 medium size yellow onions (peeled, thickly sliced to look like half moons)
  • 2 Tbsp. heavy whipping cream
  • 4 Tbsp. unsalted butter (cut into small 1/4" cubes)
  • Salt, to taste
  • Heinen's Glaze With Balsamic Vinegar Of Modena


  1. Preheat the oven to 400F.
  2. Add 1 tsp. of flour onto a clean surface. Place the thawed puff pastry onto the flour and then sprinkle the remaining 1 tsp. over the top of the pastry.
  3. Roll out the dough until it is roughly 16″x10″ in size. Transfer it to a sheet tray lined with parchment paper.
  4. Evenly layer on the cheese leaving a 1″ border on the puff pastry.
  5. Sprinkle 2 tsp. of the thyme over the cheese.
  6. Next, place the onion halves slightly overlapping one another completely covering the cheese.
  7. Brush the tops of the onions and puff pastry border with the heavy whipping cream.
  8. Evenly sprinkle the butter all over the onions.
  9. Season the onions with salt and bake in the oven for 35-40 minutes or until well browned.
  10. Garnish with the remaining 1 tsp. of thyme and balsamic glaze.

Puff Pastry Onion Tart

Chef Billy Parisi

By Chef Billy Parisi

Chef Billy Parisi is a culinary school grad who spent 15 years in the restaurant industry as a line cook, sous chef and executive chef. Now he develops, photographs and films simple and delicious recipes that will make everyone feel like a chef in their own kitchen.

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