How to make a number cake: the complete recipe to succeed on your first try
Want to impress your guests with a spectacular birthday cake? The number cake is for you. Visually stunning, it's much simpler to make than it looks. No need to be a professional pastry chef. With a good template, homemade shortcrust pastry, and a well-chosen cream, you'll get an amazing result.
In this guide, you'll find everything you need to know: the biscuit, the cream, assembly, decoration, and answers to the most frequently asked questions.
🎂 Short on time or want a truly professional result? Love and Cakes, a Parisian workshop specializing in custom cakes, makes artisanal number cakes to order in Paris. Store pickup or delivery in Île-de-France.
What is a number cake?
A number cake — or digit cake — is a cake shaped like a number or a letter. It consists of 2 layers of biscuits stacked, filled with a creamy topping, and decorated with fresh fruit, macarons, or meringues.
Born in 2018, this cake has taken over Instagram and birthday tables. It comes in number, letter (letter cake), heart, or other customized shapes. Ideal for a birthday, christening, or wedding.
An A4 size number cake serves approximately 6 portions. For 10 to 12 people, plan for an A3 size or two numbers side-by-side.
The equipment you'll need
You don't need a special mold. Here's the basic equipment:
- A paper or cardboard template (printed in A4 or A3 format)
- A rolling pin
- Parchment paper
- A piping bag + a round or star nozzle (size 1M recommended)
- A stand mixer or electric whisk
- A baking sheet
💡 Tip: Roll out your dough directly on parchment paper before cutting. This avoids moving and breaking the raw biscuit.
How to make the number cake template
The template is the foundation of everything. It determines the shape and size of your cake.
Option 1 — Printed template: Download a free template online in A4 format. Print it, cut it out, then place it on your rolled-out dough. Cut with a small knife.
Option 2 — Homemade template: Draw your number freehand on thick cardboard. Cut it out neatly. Cover it with cling film to reuse it.
Pro tip: Place your cut dough in the freezer for 15 minutes before baking. The shape will remain neat during baking.
Shortcrust pastry: the essential base
Shortcrust pastry is the ideal base. It holds up well, cuts cleanly, and provides a pleasant crunch under the cream.
Ingredients (for 2 layers of 1 A4-sized number)
- 250 g flour
- 125 g cold butter, cut into cubes
- 100 g icing sugar
- 50 g (1 medium egg)
- 3 g fine salt
- 30 g almond powder (optional, for more tenderness)
Preparation
- Mix the flour, salt, icing sugar, and cold butter with your fingertips.
- Crumble the mixture until it resembles coarse sand.
- Add the egg. Knead until a smooth ball forms.
- Wrap in cling film and refrigerate for at least 1 hour (or overnight).
- Roll out the dough to 4 to 5 mm thick.
- Cut out 2 identical shapes using your template.
- Bake at 180°C for 15 to 20 minutes. The biscuit should be golden brown at the edges and light golden in the center.
- Let cool completely before assembling.
⚠️ Caution: Never move the hot biscuit. It is fragile when it comes out of the oven. Let it cool on the baking sheet.
Which cream to choose for a number cake?
The cream must hold firm to support the top biscuit and decorations. This is the number one criterion.
Diplomat cream — the pros' choice
This is the go-to cream for number cakes. Light, creamy, and very stable, it pipes easily.
Ingredients:
- 500 ml whole milk
- 4 egg yolks
- 100 g sugar
- 40 g cornstarch
- 4 sheets gelatin (8 g)
- 300 ml cold heavy cream (30% fat minimum)
Preparation:
- Soak gelatin in cold water.
- Whisk egg yolks with sugar until pale.
- Add cornstarch. Mix well.
- Boil milk. Pour it in a thin stream over the egg mixture, stirring constantly.
- Return to heat. Cook over medium heat, stirring until thickened.
- Remove from heat, add squeezed gelatin. Mix.
- Cover with cling film, touching the surface. Let cool in the refrigerator.
- Whip heavy cream until firm peaks form.
- Gently fold into the cold pastry cream.
- Transfer to a piping bag. Refrigerate until assembly.
Mascarpone whipped cream — quick and easy
Ideal for beginners. It holds up well and can be prepared in 5 minutes.
Ingredients:
- 250 g mascarpone
- 250 ml very cold heavy cream
- 40 g icing sugar
- 1 sachet vanilla sugar
Preparation: Whisk all ingredients together until firm whipped cream forms. Transfer to a piping bag.
Whipped ganache — for chocolate lovers
Prepare it the day before, without fail, to allow it to cool and set.
Ingredients:
- 200 g white chocolate (or dark)
- 400 ml heavy cream
Preparation: Melt chocolate in 200 ml hot cream. Add the remaining cold cream. Mix. Refrigerate overnight. Whip with a whisk just before use.
Number cake assembly step-by-step
Careful assembly makes all the difference. Follow these steps in order.
- Place the first biscuit on a platter or rectangular cake board.
- Chablon the biscuit (optional but recommended): brush a thin layer of melted white chocolate over the top. Let it set. This seals the biscuit and prevents it from softening when it comes into contact with the cream.
- Pipe the cream in small, even rosettes over the entire surface of the first biscuit. Start around the edge, then work your way towards the center.
- Gently place the second biscuit on top. Press lightly and evenly.
- Pipe the cream again over the top of the second biscuit, covering the entire surface.
- Add the decorations (see next section).
- Refrigerate until ready to serve.
💡 Cutting tip: To cut cleanly, hold the top biscuit with two fingers. Use a serrated knife. Cut slowly and without applying pressure.
Decoration: let your creativity shine
Decorations transform a simple cake into a centerpiece. Here are the most effective ideas.
Fresh fruits
Strawberries, raspberries, blueberries, blackberries, slices of mango or kiwi. Fruits add color and freshness. Place them a maximum of 4 hours before serving to prevent them from oxidizing. Beyond that, brush them with a neutral glaze.
⚠️ Banana, pear, and apple oxidize very quickly. Glaze them immediately after cutting.
Macarons and meringues
They add volume and elegance. Place them at the last moment: they are sensitive to refrigerator moisture. Tip: seal their base with a thin layer of melted chocolate using a brush.
Other decoration ideas
- Colorful candies
- Wrapped chocolates (Kinder, Ferrero, Raffaello…)
- Edible flowers
- Sugar pearls
- Chocolate shavings
Organization: what to prepare the day before?
Organization is the key to a stress-free successful number cake. Here's a clear plan.
2 days or 1 day before
- ✅ Prepare the shortcrust pastry (can be stored in the refrigerator for 2 days or frozen for 3 months)
- ✅ Prepare the meringues (can be stored in an airtight container for several days)
- ✅ Prepare the whipped ganache (must rest in the fridge overnight)
The day before (D-1)
- ✅ Bake the cut biscuits. Let them cool on the baking sheet.
- ✅ Prepare the diplomat cream or mascarpone whipped cream.
- ✅ Chablon the biscuits.
- ✅ Assemble the cake. Pipe the cream. Refrigerate without fragile decorations.
D-Day
- ✅ Add fresh fruits, macarons, meringues, and small decorations.
- ✅ Take the cake out 10 minutes before serving to appreciate all the flavors.
How many portions for a number cake?
| Size | Number of portions |
|---|---|
| A5 (half A4) | 3 to 4 portions |
| A4 (21 x 29.7 cm) | 5 to 6 portions |
| A3 (42 x 29.7 cm) | 10 to 12 portions |
| 2 A4-sized numbers | 10 to 12 portions |
| 2 A3-sized numbers | 20 to 24 portions |
How to store a number cake?
Store the number cake in the refrigerator in an airtight container or covered with cling film. It keeps for 1 to 2 days. Beyond that, the pastry softens and the fruits oxidize.
Do not freeze an assembled number cake. However, you can freeze baked biscuits or raw dough without any problem.
Mistakes to avoid
These 5 mistakes can ruin a number cake. Avoid them.
1. Moving the biscuit while still hot. It breaks easily out of the oven. Let it cool on the baking sheet.
2. Using cream that is too liquid. It will collapse and drown the decorations. Check the consistency before piping.
3. Placing fruit too early. They oxidize and make the cake unappetizing. Wait until D-Day.
4. Forgetting to chablon. Without this protective layer, the cream will soften the biscuit in a few hours.
5. Neglecting the dough thickness. Too thin, it breaks. Too thick, it crushes the cream. Aim for 4 to 5 mm.
Variant ideas to personalize your number cake
One principle, dozens of versions:
- Strawberry number cake: vanilla diplomat cream + fresh strawberries
- Chocolate number cake: dark chocolate whipped ganache + chocolate shavings
- Passion fruit number cake: passion fruit diplomat cream + mango and raspberries
- Unicorn number cake: colored mascarpone whipped cream + pink and purple decorations
- Christmas number cake: white chocolate ganache + sugar holly + stars
- Wedding letter cake: initials of the newlyweds + edible roses + white macarons
Prefer to order one? Love and Cakes takes care of it for you
No time, no desire, or just want to be sure of the result? Love and Cakes is a Parisian workshop that makes custom artisanal number cakes. Each cake is handmade, without artificial colors, with fresh fruit and meticulous decoration.
What Love and Cakes offers:
- Number cakes from 6 to 45 portions
- Choice of number, flavor, and decoration
- Pickup in store in Paris (18th arrondissement) or delivery in Île-de-France
- Over 400 positive Google reviews
👉 Order your number cake on loveandcakes.fr — delivery available in Île-de-France.
In summary: the 5 keys to a successful number cake
- A precise template for a neat and regular shape.
- Very cold shortcrust pastry before and after cutting.
- A cream with real hold (diplomat, ganache, or well-whipped mascarpone).
- A chabloned biscuit to prevent softening.
- Decorations added at the last moment for a flawless finish.
Conclusion: your number cake is waiting for you
The number cake is sure to impress. Yet, it requires neither exceptional talent nor expensive equipment. Very cold shortcrust pastry, a cream that holds its shape, a cardboard template — that's all it takes for a "wow" result.
The real secret? Organization. Prepare the biscuits the day before, save the decoration for the last minute, and you'll arrive at the table serenely with a cake that steals the show.
Now it's your turn. Go for it for the next birthday — and you'll see, the pride of having made everything from scratch is priceless.
Have you tried this recipe? Leave a comment below and share your photo. And if you want to go further, discover our guide on easy-to-make homemade birthday cakes.
🎂 Want a stress-free number cake, made by a professional? Entrust it to Love and Cakes, the Parisian reference workshop for custom birthday cakes. Order online, pickup or delivery in Île-de-France.
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