Bake the Best Krempita - Fluffy Vanilla Sponge Cake Recipe

Get ready to discover Krempita (or Kosovo Shampita as it's known in some regions), a truly special Balkan dessert that's as delightful to look at as it is to eat! This iconic sweet treat features layers of flaky puff pastry sandwiching a cloud-like, creamy vanilla custard atop a delicate vanilla sponge cake base. While it might look fancy, our foolproof recipe makes it an easy to make sweet treat that anyone can master, delivering that perfect balance of rich flavor and airy texture every time.
Creamy but Light: The custard is perfectly fluffy, never heavy.
Great for Parties: Slices beautifully, making it ideal for gatherings.
Slices Cleanly: Our tips ensure picture-perfect squares every time.

Ingredients

• For the Vanilla Sponge Base:
• 4 large eggs, separated (see micro-note)
• 1/2 cup (100g) granulated sugar, divided
• 1 teaspoon pure vanilla extract
• 1 cup (120g) all-purpose flour
• 1 teaspoon baking powder
• 1/4 teaspoon salt
• 2 tablespoons whole milk
• 2 tablespoons neutral oil or melted unsalted butter
• Micro-notes for Sponge Base:
  Why separated eggs = airy crumb: Whipping egg whites separately incorporates more air, leading to a much lighter, more delicate vanilla sponge cake texture that’s characteristic of traditional Krempita.
  How to avoid deflating: Gently fold the whipped whites into the batter in stages. Overmixing will knock out the air, resulting in a dense sponge.
• For the Creamy Vanilla Custard Filling:
• 5 cups (1.2 liters) whole milk
• 6 large egg yolks (or whole eggs, but for the richest flavor and color, yolks are preferred in this recipe)
• 1 cup (200g) granulated sugar
• 1/2 cup (60g) cornstarch (see micro-note)
• 1 teaspoon salt
• 2 teaspoons pure vanilla extract (or 1 teaspoon vanilla extract + 1 tablespoon vanilla sugar)
• 1 teaspoon unflavored gelatin powder (optional, but highly recommended for stability and clean slices)
• Micro-notes for Custard Filling:
  What cornstarch does: Cornstarch is our primary thickener, creating a smooth, stable custard that sets beautifully without becoming gluey.
  Why tempering prevents scrambled eggs: Slowly whisking a small amount of warm milk into the egg yolk mixture gradually raises its temperature, preventing the eggs from scrambling when added to the hot milk.
• For the Pastry Top:
• 1 sheet (approx. 10-12 oz / 280-340g) store-bought puff pastry, thawed if frozen (see micro-note)
• 2 tablespoons powdered sugar, for dusting
• Micro-notes for Pastry Top:
  Why pre-cutting the top matters: Scoring or pre-cutting the puff pastry before baking (or immediately after while warm) allows for clean, crisp slices later without crushing the delicate custard.
• For the Optional Simple Syrup (supports your "syrup" intent):
• 1/2 cup (100g) granulated sugar
• 1/2 cup (120ml) water
• 1/2 teaspoon pure vanilla extract
• Micro-notes for Simple Syrup:
  When to use it: This simple syrup for cake is perfect if you're baking the sponge ahead of time and it feels a little dry, or if you simply prefer a slightly sweeter, moister base. Don't overdo it!

Directions

1. Prepare and Bake the Puff Pastry Top
   1. If frozen, thaw the puff pastry sheet according to package directions (usually in the refrigerator overnight or at room temperature for 30-40 minutes).
   2. Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper.
   3. Lightly flour your work surface and roll out the puff pastry sheet to roughly a 9x13 inch rectangle, or slightly larger than your baking dish.
   4. Using a sharp knife or pizza cutter, gently score the pastry into 12-16 squares (the size you'll want your finished Krempita slices to be). Do not cut all the way through, just score the surface. Alternatively, you can fully cut the squares and bake them individually.
   5. Prick the entire surface of the pastry with a fork (docking) to prevent it from puffing up too much.
   6. Transfer the pastry to the prepared baking sheet and bake for 15-20 minutes, or until deeply golden brown and crisp.
   7. Remove from the oven and immediately (if you didn't pre-score) or after a minute or two, carefully cut along the scored lines while it's still warm to ensure clean breaks. Let the pastry squares cool completely on a wire rack.
2. Make the Vanilla Sponge Sheet
   1. Preheat oven to 350°F (175°C). Lightly grease and flour a 9x13 inch baking dish (or a sheet pan if you prefer to bake it thinner and trim to size).
3. Separate eggs: Carefully separate the egg whites from the yolks. Place egg whites in a very clean, dry bowl of a stand mixer (or use a hand mixer). Place yolks in a separate medium bowl.
4. Whip whites: Add half of the granulated sugar (1/4 cup) to the egg whites. Beat on medium-high speed until stiff, glossy peaks form. Set aside.
5. Beat yolks: To the egg yolks, add the remaining 1/4 cup of sugar and 1 teaspoon of vanilla extract. Beat with the mixer on high speed until the mixture is pale yellow and thick, about 3-4 minutes.
6. Combine dry ingredients: In a small bowl, whisk together the flour, baking powder, and salt.
7. Fold in: Gently fold about one-third of the whipped egg whites into the yolk mixture to lighten it.
8. Alternate additions: Add half of the dry ingredients to the yolk mixture, folding gently until just combined. Then, fold in the milk and oil/melted butter. Add the remaining dry ingredients, folding until almost combined.
   1. Finally, gently fold in the remaining whipped egg whites in two additions, being careful not to deflate the batter. The goal is a light, airy batter for your vanilla sponge cake.
   2. Pour the batter into the prepared baking dish and spread evenly.
   3. Bake for 15-20 minutes, or until golden brown and a toothpick inserted into the center comes out clean.
   4. Let the sponge cool completely in the pan on a wire rack.
9. Prepare the Optional Simple Syrup
   1. In a small saucepan, combine 1/2 cup granulated sugar and 1/2 cup water.
   2. Bring to a simmer over medium heat, stirring until the sugar is completely dissolved.
   3. Remove from heat and stir in 1/2 teaspoon vanilla extract.
   4. Let the simple syrup for cake cool completely before using.
   5. Once the sponge is cool, lightly brush the cooled simple syrup over the top of the vanilla sponge cake base. Do not soak it; a light brushing is enough to add moisture and flavor.
10. Cook the Creamy Vanilla Custard
    1. If using gelatin, bloom it now: sprinkle gelatin powder over 2 tablespoons of cold water in a small bowl. Let it sit for 5 minutes to soften.
11. Warm milk: In a large, heavy-bottomed saucepan, heat 5 cups of whole milk over medium heat until it's steaming and small bubbles appear around the edges, but do not boil.
12. Whisk yolks & thickener: In a separate large bowl, whisk together the 6 egg yolks, 1 cup granulated sugar, 1/2 cup cornstarch, and 1/4 teaspoon salt until the mixture is completely smooth and pale.
13. Temper the eggs: Slowly ladle about 1 cup of the warm milk into the egg yolk mixture, whisking constantly to gradually raise the temperature of the eggs without scrambling them.
14. Return to pot: Pour the tempered egg mixture back into the saucepan with the remaining warm milk.
15. Cook custard: Return the saucepan to medium heat. Whisk constantly and vigorously, scraping the bottom and sides of the pot, for 8-12 minutes, until the custard thickens considerably and comes to a gentle boil (you'll see large bubbles popping on the surface).
    1. Checkpoint box: When ready, the custard should be thick enough to coat the back of a spoon, and when you run your finger across the spoon, it leaves a clear path. It should also have a glossy appearance.
16. Off heat: Remove the pot from the heat. Stir in 2 teaspoons of vanilla extract.
17. Dissolve gelatin (if using): If using gelatin, gently warm the bloomed gelatin (either in a microwave for 10-15 seconds or over a hot water bath) until it's completely dissolved and clear. Whisk the dissolved gelatin into the hot custard until fully incorporated.
18. Prevent skin: Immediately press plastic wrap directly onto the surface of the custard to prevent a skin from forming as it cools.
    1. Let the custard cool at room temperature until it's "barely warm" (around 90-100°F / 32-38°C). This is important before assembly to prevent the pastry from getting soggy.
19. Assemble the Krempita
    1. Place the cooled vanilla sponge cake base into your 9x13 inch baking dish. If you baked it on a sheet pan, carefully trim and transfer it.
    2. Pour the barely warm custard evenly over the sponge base. Smooth the top with an offset spatula.
    3. Cover the dish with plastic wrap and chill in the refrigerator for at least 4 hours, or preferably overnight, until the custard is completely firm and set.
    4. Once the custard is firm, arrange the pre-cut, cooled puff pastry squares on top of the custard layer.
20. Chill & Slice
    1. For the best results and cleanest slices, chill the assembled Krempita for a minimum of 4 hours, but ideally overnight.
    2. To cut, use a long, sharp serrated knife or a hot, clean knife (wiped clean between each cut). Cut along the score marks of your puff pastry squares for perfectly neat portions.
    3. Just before serving, dust generously with powdered sugar.