Onion Tart

5 from 35 votes

A delicious appetizer made with puff pastry and sweet onions.

Course Appetizer

Cuisine American

Prep Time 10

Cook Time 35

Total Time 45

Servings tart

Calories 190kcal

Preheat oven to 400°F
Saute onions in a hot pan with a bit of olive oil, until they are soft and slightly translucent. Remove onions from pan and allow to cool slightly.
1 sweet onion, 1 tablespoon olive oil
Roll out your puff pastry into a 10x10 inch square. If using store-bought puff pastry, roll it usually comes in a rectangle. No need to roll it out.
1 sheet puff pastry
Trim ¼ - ½ inch of each side. Save these pieces!
Place puff pastry on a baking sheet lined with parchment paper.
Make egg wash by mixing egg adn water together. Brush a thin strip of egg wash around the perimeter of the puff pastry.
1 egg, 1 tablespoon water
Place the trimmed pieces on top of the egg wash. This becomes the sides of the tart.
Spread Greek yogurt over the inside of the tart.
¼ cup Greek yogurt
Add onions.
Top with grated parmesan cheese
2 tablespoons Parmesan
Sprinkle with fresh herbs and a bit of salt and pepper.
1 teaspoon fresh thyme, salt, pepper
Brush top of pastry with egg wash.
Bake in preheated 400°F oven for 20-25 minutes, until pastry is fully cooked.
Allow tart to cool for at least 10 minutes before slicing and serving.

Avoid getting the egg wash on the sides of the tart. This will seal the puff pastry and it may not rise into the flaky layers.

Place the cut ends of the pastry with the rough, or uneven side towards the inside of the pastry. This will give you nice clean lines on the outside of the tart.