Polish cake

Yield: One 9×13-inch (23×33 cm) cake, serving 12-16 people
Total Time: 3 hours 45 minutes (includes inactive chilling)
Active Time: 1 hour 15 minutes
Intensity Level: Medium-High (requires careful custard tempering and choux pastry handling)

Why this recipe works: Two layers of light, eggy choux pastry (pâte à choux) sandwich a gloriously thick, creamy vanilla custard. Unlike many layered cakes, Karpatka is not fussy about perfect edges—its charm lies in its rough, cracked top layer. The long chilling time ensures clean slices and a melded, luxurious texture.

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📊 Recipe at a Glance

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🥛 Nutrition Information (per serving, based on 14 slices)

Note: Nutrition is estimated using full-fat dairy and standard butter. Variations will change values.

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🛒 Ingredients

For the Vanilla Custard Filling (Budyń)

• 4 cups (1 L) whole milk

• 1 cup (200 g) granulated sugar

• 2 vanilla bean pods (or 1 tbsp vanilla bean paste / 2 tbsp pure vanilla extract)

• ½ cup (60 g) cornstarch

• 6 large egg yolks (room temperature)

• 2 sticks (226 g) unsalted butter, softened to room temperature

For the Choux Pastry Layers (Ciasto Parzone)

You will make this twice, or make a double batch and bake in two separate trays.

• 1 cup (240 ml) water

• 1 stick (113 g) unsalted butter, cut into pieces

• 1 tbsp granulated sugar

• ½ tsp fine salt

• 1 cup + 2 tbsp (135 g) all-purpose flour (unbleached)

• 4 large eggs (room temperature)

For Finishing

• 2–3 tbsp powdered sugar (for dusting)

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🔪 Step-by-Step Instructions

PART 1: Make the Custard Filling (Day before or 3+ hours ahead)

Intensity: Medium (tempering hot milk into egg yolks without scrambling)

1. Prepare the milk base. In a heavy-bottomed saucepan, combine 3 ½ cups of the whole milk with 1 cup sugar. Split the vanilla beans lengthwise, scrape the seeds into the milk, and drop the pods in as well. Heat over medium until steaming (small bubbles at edges), about 5-7 minutes. Do not boil.

2. Temper the egg yolks. In a medium bowl, whisk the 6 egg yolks with the cornstarch until pale and smooth. Whisk in the remaining ½ cup cold milk to form a thin slurry.

3. Combine. Slowly pour about 1 cup of the hot milk mixture into the egg slurry while whisking constantly. Then pour the tempered egg mixture back into the saucepan in a thin stream, whisking vigorously.

4. Thicken. Return pan to medium heat. Switch to a wooden spoon or heatproof spatula. Stir constantly, scraping the bottom and corners. The mixture will suddenly thicken into a pudding-like mass within 2-3 minutes. It should be very stiff. Remove from heat.

5. Cool slightly. Discard vanilla pods. Transfer the hot custard to a wide, shallow bowl. Press plastic wrap directly onto the surface (to prevent a skin). Cool at room temperature for 20 minutes, then refrigerate until completely cold (at least 2 hours, ideally overnight).

6. Cream the butter. When custard is cold, beat the softened butter in a stand mixer with paddle attachment (or large bowl with hand mixer) until light and fluffy, about 3-4 minutes.

7. Combine. Add the cold custard, one spoonful at a time, to the whipped butter, beating well after each addition. Critical: The custard must be fully chilled or the butter will melt and the filling will be runny. Continue until all custard is incorporated. You’ll have a silky, spreadable cream. Cover and refrigerate until assembly.

PART 2: Make the Choux Pastry (Two Separate Batches)

Intensity: Medium (proper flour incorporation and egg addition)

Note: Do not double the choux recipe. Make one complete batch, bake it, cool it, then make the second identical batch. This ensures even baking and puffed layers.

For each batch (one cake layer):

1. Preheat oven to 400°F (200°C). Line a 9×13-inch baking sheet (or jelly roll pan) with parchment paper. Trace the dimensions onto the paper if needed.

2. Cook the dough. In a medium saucepan, combine water, 1 stick butter, sugar, and salt. Bring to a rolling boil over medium-high heat. Reduce heat to low. Add all the flour at once and stir vigorously with a wooden spoon. The dough will form a ball and pull away from the sides, with a thin film on the pan bottom (about 1 minute).

3. Dry the dough. Continue stirring over low heat for another 1-2 minutes. This evaporates excess moisture – essential for a puff.

4. Cool slightly. Transfer dough to a mixing bowl. Let sit for 5 minutes, stirring occasionally, until no longer steaming hot (but still warm).

5. Add eggs, one by one. Beat in the first egg. The dough will separate and look curdled – keep beating. After 30 seconds, it will come back together into a glossy paste. Add the second egg, repeat. Add third egg, repeat. For the fourth egg: beat it in a small bowl first, then add gradually. You may not need all of it. Stop when the dough is soft, shiny, and falls slowly from a spoon in a thick “V” shape. Overly runny dough will not hold its shape.

6. Spread the layer. Scoop the dough onto the prepared pan. Using an offset spatula (or wet fingertips), spread evenly to a 9×13-inch rectangle about ⅜ inch thick. It’s okay if the surface is uneven – that’s the “mountain” effect.

7. Bake. Place pan in middle of oven. Bake at 400°F for 20 minutes. Then reduce heat to 350°F (175°C) and bake another 10-15 minutes until deep golden brown, crisp, and puffed. Do not open the oven door during the first 20 minutes.

8. Cool completely on a wire rack. The layer will deflate slightly – that’s normal. Repeat this entire process for the second layer.

PART 3: Assembly (Intensity: Low)

1. Choose the better-looking layer for the top. The other layer will be the bottom. If either layer is very puffed and domed, you can gently press it flat before filling.

2. Remove custard filling from fridge. It should be thick and spreadable – like soft cream cheese frosting.

3. Place the bottom choux layer on your serving platter or a cutting board. Spread all of the custard filling evenly over it, leaving a ¼-inch border (it will spread when you add the top).

4. Place the second choux layer on top, smooth side up (or crackled side up – both are fine). Gently press down to bond.

5. Cover loosely with plastic wrap (don’t let it touch the surface). Refrigerate for at least 2 hours – ideally 4 hours or overnight. This step is non-negotiable: chilling allows the cream to set and the choux to soften into a cake-like texture.

PART 4: Finishing & Serving

Just before serving, dust the top generously with powdered sugar through a fine-mesh sieve. For a dramatic “mountain snow” look, use a stencil or simply let it fall naturally.

To serve: Use a sharp, thin-bladed knife. Wipe the blade clean between each cut. Slice into rectangles or squares.