These Caramelized Onion Tarts are an instant crowd pleaser! Tender apples and deliciously caramelized onions meet flaky puff pastry to form a savory appetizer that’s sure to delight.

A layer of Greek yogurt holds it all together and melts into an irresistibly creamy spread. Serve these at your next get-together or holiday celebration!

Hand picking up a slice of the Caramelized Onion Tart.
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This easy recipe has just 4 ingredients (if you don’t count the salt and pepper) and is really simple to put together. I love serving this onion tart puff pastry for intimate dinner parties or holiday open houses — no matter the occasion, we always get rave reviews! 

Plus, you can throw it together in about 10 minutes and toss it in the oven. It will bake to perfection while you finish those last-minute touches or throw on your party clothes. Any dish that gives you more time with your guests is a winner in my book!

WHY YOU’LL LOVE THIS RECIPE

  • The perfect balance of savory and sweet.
  • Can be made ahead.
  • Crowd pleaser!
  • Perfect for parties (NYE, Christmas, or game day)

Key Ingredients

Ingredients to make Caramelized Onion Tarts.
  • Onions – Medium yellow onions are usually the standard for this kind of recipe. You can use sweet onions if you would like, just keep a close eye so the extra sugar doesn’t cause them to burn. Red onions might also be fun, especially if your apples are a bit more tart.
  • Apples – Choose a firm variety with a mild, sweet flavor for this onion tart puff pastry. Honeycrisp, Fuji, or Gala work well and are easy to find. If available, Braeburn or Pink Lady (Cripps) are great too.
  • Puff pastry – You can find these in sheets in the frozen aisles of your store (typically with the rolls or dessert toppings). Thaw them on the counter until pliable before getting started.
  • Plain Greek Yogurt – Adds just the right amount of creaminess to tie all of the flavors together. You could substitute a sour cream if needed, but avoid using regular yogurt. The consistency is too thin and may cause the caramelized onion tarts to become soggy.

I can’t even begin to describe the symphony of flavors this onion tart puff pastry delivers. The pastry crust is buttery and flaky, the onions and apples are melt-in-your-mouth tender, and that creamy layer in between is just divine.

Trust me, it’s wise to have a backup in the freezer — everyone will be fighting over that last slice!

How To Make Caramelized Onion Tarts

This is an overview of the instructions, be sure to see the recipe card for all the details.

4 image collage showing the steps to make puff pastry onion tart.

Before you get started line the baking sheet with parchment paper and set it aside.

  1. Cook the sliced onions in a little oil until softened and golden brown. Stir occasionally to prevent them from sticking and help them cook evenly. 
  2. Add the sliced apples, plus salt and pepper, and stir together. Cook a few more minutes.
  3. Place the thawed puff pastry on the parchment lined baking sheet, prick the pastry with a fork, all over.
  4. Spread the Greek yogurt evenly over the dough, leaving a border around the outside. Then, spoon the mixture of apples and caramelized onion on the puff pastry.

Bake for about 30 minutes, or until the dough is cooked through, golden and crisp. Serve warm from the oven, sliced into squares.

Just baked puff pastry with onions and apples, garnished with fresh thyme.

Expert Tips

  • Less is more when it comes to caramelizing onions. Leave them alone as much as you can to get that gorgeous color all over.
  • For this recipe, don’t quite caramelize all the way to avoid getting too dark in the oven.
  • Don’t forget to poke holes in the dough! This will allow the steam to escape, which keeps it level and prevents it from puffing up too tall as it bakes.
  • Apples can be diced instead of sliced if you prefer.
  • For a variation, try some cheese. Reduce or omit the yogurt and dot the caramelized onion puff pastry with a little gorgonzola or goat cheese.
Onion tart on puff pastry cut into 9 squares on a cutting board garnished with fresh thyme.

Frequently Asked Questions

Is there sugar in caramelized onions?

There are natural sugars in the root vegetables, which allow them to caramelize in the first place. But there’s no added sugar in this recipe.

What can I add to onion tart puff pastry?

A sprinkle of pomegranate arils over the top can add a festive pop of color. Crispy bacon crumbles would be salty and delicious as well!

Can I save leftover caramelized onion tarts?

Yes! Transfer slices to an airtight container and refrigerator for 1-2 days. Reheat in the oven until crisp and warmed through.

Make Ahead Instructions

These caramelized onion tarts can be assembled and frozen up to 1 month in advance.

  • Freeze them (unbaked) on parchment-lined baking sheets until firm, then wrap in several layers of plastic.
  • Bake from frozen at 400 degrees for 40-50 minutes, then drop the temperature to 250 degrees to keep them warm. Slice into squares just as your guests start to arrive. 

More Tasty Appetizers

Sometimes we just make a meal out of appetizers. No party required! It’s fun to have a variety of things on your plate.

Some of our favorites are Mac and Cheese Bites, Bacon Wrapped Apricots, and BLT Salad on a Stick (bonus, a fun way to eat those veggies).

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You can also follow along on YouTube and Instagram!

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📋 Recipe

Onion tart on puff pastry cut into 9 squares on a cutting board garnished with fresh thyme.

Caramelized Onion Tarts

Tender apples and deliciously caramelized onions meet flaky puff pastry to form a savory appetizer that’s sure to delight.
5 from 3 votes
Print Pin Rate Save
Course: Appetizer
Cuisine: American
Prep Time: 10 minutes
Cook Time: 30 minutes
Time for onions to caramelize: 30 minutes
Total Time: 1 hour 10 minutes
Servings: 18 people
Calories: 198kcal
Cost: $8

Equipment

  • 2 rimmed baking sheets
  • Parchment papaer

Ingredients

  • 2 Tbs butter unsalted
  • 2 medium onions sliced
  • 2 red apples cut into small pieces
  • 1/2 tsp salt
  • 1/4 tsp black pepper
  • 2 sheets frozen puff pastry thawed
  • 1/2 cup plain Greek yogurt must be Greek, regular is too thin and wet.

Instructions

  • Preheat oven to 400.
  • Heat the butter in a large skillet over medium heat.
  • Add the onions, reduce heat to medium low, and cook, stirring occasionally, until soft and golden brown.
  • Stir in the apples, salt, and pepper and cook until just tender, about 2 minutes.
  • Place each sheet of pastry on a parchment lined baking sheet and prick all over with a fork.
  • Spread with the Greek yogurt, leaving a 1/2 inch border.
  • Top with the onion mixture and bake until the pastry is crisp and browned, 30 minutes.
  • Cut into squares before serving.

Video

Notes

  • Crumple parchment paper into a ball, then straighten out, this makes it much more pliable to work with when placing it on your pan.
  • For this recipe, don’t quite caramelize all the way to avoid getting too dark in the oven.
  • Make sure to use Greek yogurt because of its thickness. Sour Cream is a great substitute.
  • Don’t forget to poke holes in the dough! This will allow the steam to escape, which keeps it level and prevents it from puffing up too tall as it bakes.
  • Apples can be diced instead of sliced if you prefer.
  • For a variation, try some cheese. Reduce or omit the yogurt and dot the caramelized onion puff pastry with a little gorgonzola or goat cheese.

Nutrition

Calories: 198kcal | Carbohydrates: 18g | Protein: 2g | Fat: 13g | Saturated Fat: 4g | Cholesterol: 3mg | Sodium: 141mg | Potassium: 91mg | Fiber: 1g | Sugar: 4g | Vitamin A: 51IU | Vitamin C: 3mg | Calcium: 18mg | Iron: 1mg
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