Cranberry, Brie, and Caramelized Onion Puff Pastry Bites

These golden, flaky pastry bites bring together creamy melted Brie, sweet caramelized onions, and tart cranberry sauce, with fresh rosemary for a festive finishing touch. Baked in a mini muffin pan, their crisp, square corners frame a rich little filling that feels right at home on a Christmas appetizer platter.

Quick Recipe Version (TL;DR)

• Yield: 24 bites, or 12 appetizer servings of 2 bites each
• Prep Time: 25 minutes, plus puff pastry thawing if needed
• Cook Time: 1 hour 5 minutes
• Total Time: 1 hour 35 minutes, including 5 minutes of cooling; excludes thawing

Quick Ingredients

• 2 medium yellow onions, thinly sliced, about 12 ounces (340 g) prepared
• 1 tablespoon (14 g) unsalted butter
• 1 tablespoon (15 ml) olive oil, plus 1 teaspoon (5 ml) for the pan
• 1/4 teaspoon fine sea salt and 1/8 teaspoon ground black pepper
• 2 tablespoons (30 ml) water, as needed for the onions
• 2 sheets frozen puff pastry, thawed but cold, from one 17.3-ounce (490 g) package
• 1 tablespoon (8 g) all-purpose flour, for rolling
• 8 ounces (227 g) Brie, cut into 24 equal pieces
• 3/4 cup (210 g) thick whole-berry cranberry sauce
• 1 large egg beaten with 1 tablespoon (15 ml) water
• 2 teaspoons finely chopped fresh rosemary

Do This

• 1. Heat the butter and 1 tablespoon olive oil in a skillet. Add the onions, salt, and pepper; cook for about 40 minutes, stirring regularly, until deeply golden. Add the optional water a tablespoon at a time if needed. Cool for 10 minutes while preparing the pastry.
• 2. Heat the oven to 400°F (200°C). Grease a 24-cup mini muffin pan with the remaining 1 teaspoon olive oil.
• 3. Roll each pastry sheet into a 9-by-12-inch rectangle on a lightly floured surface. Cut each into twelve 3-inch squares and gently press them into the muffin wells.
• 4. Divide the onions among the pastry cups, about 1 1/2 teaspoons each. Add one piece of Brie and 1 1/2 teaspoons cranberry sauce to each.
• 5. Lightly brush the exposed pastry corners with egg wash. Refrigerate the filled pan for 10 minutes.
• 6. Bake for 22–25 minutes, until puffed and deeply golden. Cool in the pan for 5 minutes, then transfer to a platter and sprinkle with rosemary.

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Why You’ll Love This Recipe

• A lovely balance of flavors: Buttery pastry and creamy Brie meet tangy cranberry sauce and naturally sweet onions.
• Elegant without being complicated: Store-bought puff pastry does most of the work.
• Perfect for holiday gatherings: Each bite is easy to serve and just the right size for an appetizer platter.
• Make-ahead friendly: Prepare the onions in advance so assembly is quick when guests are on their way.

Grocery List

• Produce: 2 medium yellow onions; fresh rosemary.
• Dairy: Unsalted butter; 8 ounces Brie.
• Eggs: 1 large egg.
• Frozen: One 17.3-ounce package puff pastry containing 2 sheets.
• Pantry: Olive oil, all-purpose flour, thick whole-berry cranberry sauce, fine sea salt, and ground black pepper.

Full Ingredients

For the Caramelized Onions

• 1 tablespoon (14 g) unsalted butter
• 1 tablespoon (15 ml) olive oil
• 2 medium yellow onions, peeled, halved, and sliced about 1/8 inch thick, approximately 12 ounces (340 g) prepared
• 1/4 teaspoon fine sea salt
• 1/8 teaspoon ground black pepper
• 2 tablespoons (30 ml) water, as needed to loosen browned bits

For the Pastry Bites

• 1 teaspoon (5 ml) olive oil, for greasing the pan
• 2 sheets frozen puff pastry, thawed according to package directions but still cold, from one 17.3-ounce (490 g) package
• 1 tablespoon (8 g) all-purpose flour, for dusting the work surface
• 8 ounces (227 g) Brie, chilled and cut into 24 equal pieces; rind left on
• 3/4 cup (210 g) thick whole-berry cranberry sauce, homemade or store-bought
• 1 large egg
• 1 tablespoon (15 ml) water, for the egg wash

For Finishing

• 2 teaspoons finely chopped fresh rosemary

Step-by-Step Instructions

Step 1: Slowly caramelize the onions

Heat the butter and 1 tablespoon olive oil in a wide, heavy skillet over medium heat. Add the sliced onions, salt, and pepper. Cook for 5 minutes, stirring frequently, until the onions begin to soften.

Reduce the heat to medium-low and continue cooking for approximately 35 minutes, stirring every few minutes and more frequently toward the end. The onions should become very soft and a rich golden brown, not crisp or blackened. If browned bits begin sticking firmly to the skillet, add 1 tablespoon water and scrape them up; repeat once if needed. Caramelization can take a little longer depending on your pan and stove, so use the color and texture as your guide.

You should have approximately 3/4 cup caramelized onions. Transfer them to a shallow bowl and let cool for 10 minutes while you prepare the pastry.

Step 2: Prepare the oven and mini muffin pan

Heat the oven to 400°F (200°C), conventional setting, with a rack in the center. Lightly grease all 24 wells of a standard mini muffin pan with 1 teaspoon olive oil. Use wells approximately 1 3/4 inches across the top and 1 inch deep.

If your pan has only 12 wells, bake in two batches, keeping the second batch refrigerated until ready to bake. Allow additional baking time for that second batch.

Step 3: Roll and cut the pastry squares

Lightly dust your work surface with the flour. Unfold one cold pastry sheet and gently roll it into a 9-by-12-inch rectangle. Cut it into twelve 3-by-3-inch squares: three squares across the short side and four along the long side. Repeat with the second sheet to make 24 squares.

Gently press one square into each muffin well, easing the pastry into the bottom without stretching it thin. Leave the four corners pointing upward and slightly outward. If the pastry becomes soft or sticky as you work, refrigerate it for 10 minutes before continuing.

Step 4: Add the onions, Brie, and cranberry sauce

Divide the cooled caramelized onions evenly among the pastry cups, using approximately 1 1/2 teaspoons per cup. Set one piece of Brie on top of the onions, then spoon 1 1/2 teaspoons cranberry sauce over the cheese.

Keep the filling centered and below the tips of the pastry corners. There is no need to remove the Brie rind: it is edible and helps the cheese hold together as it melts.

Step 5: Brush and chill the pastry

Beat the egg with 1 tablespoon water until smooth. Use a pastry brush to lightly coat only the exposed pastry corners and upper edges. You will not need all the egg wash; discard any remainder after brushing.

Refrigerate the filled pan for 10 minutes. This short chill helps the pastry keep its shape and develop distinct, flaky layers in the oven.

Step 6: Bake until crisp and golden

Bake for 22–25 minutes, checking at 22 minutes. The pastry should be puffed and deeply golden, the cheese melted, and the cranberry sauce gently bubbling. A pale pastry edge usually means the bites need another minute or two.

If your oven browns unevenly, rotate the pan after 15 minutes. Avoid opening the oven during the first 15 minutes so the pastry can rise properly.

Step 7: Finish with rosemary and serve

Let the bites cool in the pan for 5 minutes; the filling will be very hot straight from the oven. Run a thin butter knife around any stuck edges, then carefully lift the bites onto a serving platter.

Sprinkle the tops evenly with the finely chopped fresh rosemary. Serve warm, when the corners are crisp and the Brie is soft and creamy.

Pro Tips

• Keep the pastry cold: Cold pastry puffs more cleanly. If it feels greasy or floppy, pause and chill it before continuing.
• Use thick cranberry sauce: A loose, runny sauce can soften the pastry. If homemade sauce is thin, simmer it until spoonable, then cool it completely before measuring.
• Give the onions time: Deeply caramelized onions provide sweetness without added sugar. Raising the heat too much will brown their edges before their centers soften.
• Cut chilled Brie: Cold cheese is easier to portion. If it becomes sticky, refrigerate it for 10 minutes before cutting.
• Chop the rosemary finely: Tiny pieces distribute its piney flavor without leaving tough, needle-like leaves in each bite.

Variations

• Cranberry-orange: Stir 1 teaspoon finely grated orange zest into the 3/4 cup cranberry sauce before assembling.
• Toasted pecan crunch: Sprinkle the baked bites with 2 tablespoons finely chopped toasted pecans along with the rosemary. Clearly label this version for guests with nut allergies.
• Thyme instead of rosemary: Finish with 2 teaspoons fresh thyme leaves for a gentler herbal flavor.

Storage & Make-Ahead

Prepare components ahead: Refrigerate the caramelized onions in an airtight container for up to 3 days. Keep cranberry sauce refrigerated separately. Thaw frozen puff pastry in the refrigerator according to its package directions, usually overnight.

Assemble ahead: Assemble the bites up to 4 hours before baking, cover loosely, and refrigerate. Apply the egg wash just before baking. Bake directly from the refrigerator, adding 1–3 minutes if needed for deeply golden pastry.

Store leftovers: Refrigerate cooled bites in an airtight container within 2 hours of baking and use within 3 days. Reheat on a baking sheet at 350°F (175°C) for 10–15 minutes, until crisp and heated to 165°F (74°C) in the center. Avoid the microwave if you want to preserve the flaky texture.

Freeze: Freeze fully cooled baked bites in a single layer, then transfer to a freezer-safe container for up to 1 month. Reheat from frozen at 350°F (175°C) for 15–20 minutes, or until the centers reach 165°F (74°C). Loosely cover with foil if the corners brown before the filling is hot.

Nutrition (per serving)

Estimated for 2 bites, based on 12 servings. Values vary with the puff pastry and cranberry sauce used.

Calories: 320 kcal | Carbs: 29g | Protein: 8g | Fat: 19g | Saturated Fat: 9g | Fiber: 1g | Sugar: 9g | Sodium: 300mg | Cholesterol: 44mg