That is the absolute peak of German cake nostalgia! While a traditional Frankfurter Kranz is usually a towering, ring-shaped cake that can be quite intimidating to make, the baking sheet version (Frankfurter Kranz vom Blech) is the “secret weapon” for anyone who wants that childhood flavor with half the effort.

It has everything: the fluffy sponge, the silky German buttercream, the tart jam, and—most importantly—the Krokant (hazelnut brittle) crunch.

🍰 Frankfurter Kranz Sheet Cake (The Sunday Classic)

This version is easier to slice, perfect for a crowd, and tastes exactly like the one from Grandma’s Sunday coffee table.

📋 Ingredients

🔪 Instructions (Simplified Step-by-Step)

1. The Easy Sponge (10 Minutes Prep)

1. Preheat: Set oven to 180°C (350°F). Line a deep baking sheet with parchment paper.
2. Mix: Beat eggs, sugar, and vanilla sugar for at least 5 minutes until very pale and fluffy.
3. Fold: Sift together flour, baking powder, and cornstarch. Fold gently into the egg mixture.
4. Bake: Spread evenly on the sheet and bake for 15–20 minutes. Let it cool completely.

2. The Traditional Buttercream (The “German” Way)

1. Pudding: Cook the vanilla pudding according to the package with the milk and sugar. Cover the surface directly with plastic wrap (so no skin forms) and let it cool to room temperature.
2. Emulsify: Beat the soft butter until white and fluffy. Add the room-temp pudding one spoonful at a time.
   • Secret: Both the butter and pudding must be the same temperature, or the cream will curdle!

3. Assembly (The Layers of Childhood)

1. Jam: Spread a thin, even layer of red currant jam over the cooled sponge. This tartness is essential to balance the rich buttercream.
2. Cream: Spread about two-thirds of the buttercream over the jam layer.
3. Krokant: Generously sprinkle the hazelnut Krokant over the entire surface until it’s a golden, crunchy sea.

4. The Sunday Finish

1. Rosettes: Use the remaining buttercream to pipe small rosettes onto the cake (marking 12 or 16 slices).
2. Cherries: Place a glacé cherry on each rosette.

✨ Why the “Sheet” Version is Better

• The Ratio: You get more of the crunchy Krokant and tart jam in every bite compared to the tall ring version.
• No Toppling: Unlike the ring cake, which can slide if the cream is too soft, the sheet cake is sturdy and stays perfect even during transport.
• The Scent: The smell of the toasted hazelnuts and vanilla pudding is what makes “Sundays at Grandma’s” unforgettable.

Pro Tip: Let the cake sit in the fridge for at least 4 hours (or overnight). The jam slightly soaks into the sponge, making it incredibly moist.

Would you like the 5-minute recipe for homemade Hazelnut Krokant if you can’t find it at the store?