Ultimate Birthday Cake with Swiss Buttercream

Ingredients

• 300 g Cake flour (bleached) (Sifted twice)
• 400 g Granulated sugar
• 6 g Baking powder (double‑acting)
• 2 g Salt
• 2 g Glycerol monostearate (EMULSIFIER) (Optional – found in boxed cake mixes)
• 100 g Unsalted butter (Melted, then cooled to room temperature)
• 100 g Neutral oil (e.g., vegetable or canola)
• 6 Eggs (Separated – yolks and whites kept separate)
• 10 ml Vanilla extract (Add with yolks)
• 200 ml Whole milk (Heated to ~200°F (93°C) before adding)
• 180 g Egg whites (for meringue) (Whipped to medium peaks before sugar incorporation)
• 150 g Granulated sugar (for meringue) (Added gradually to egg whites)
• 150 g Egg whites (Swiss buttercream) (Will be cooked with sugar)
• 300 g Granulated sugar (Swiss buttercream)
• 2 g Cream of tartar (Stabilizes the meringue)
• 400 g Unsalted butter (for buttercream) (Softened to ~65°F (18°C))
• 1 g Salt (buttercream)
• 30 ml Orange liqueur (optional soaking liquid) (Mixed with a little milk for soaking)

Instructions

1. Prepare dry ingredients

   Sift cake flour, baking powder, salt, glycerol monostearate, and sugar together twice to ensure even distribution.

   Time: PT1M

2. Prep the pans

   Lightly spray the bottom of each 8‑inch round pan, brush evenly, then line the bottom with parchment circles. Leave the sides un‑greased for a straight‑edge rise.

   Time: PT2M

3. Melt butter and combine with oil

   Melt 100 g unsalted butter, then stir in 100 g neutral oil until a homogeneous paste forms.

   Time: PT2M

4. Separate eggs

   Separate six large eggs, placing yolks in a large bowl and whites in a clean, dry bowl.

   Time: PT2M

5. Combine butter‑oil paste with yolks and vanilla

   Add the yolks and 10 ml vanilla extract to the butter‑oil mixture and whisk until smooth.

   Time: PT3M

6. Whip egg whites to medium peaks

   Using the whisk attachment, beat the egg whites until foamy, then gradually add 150 g sugar while continuing to beat to medium peaks.

   Time: PT5M

7. Heat milk

   Warm 200 ml whole milk in a saucepan until it reaches about 200°F (93°C).

   Time: PT5M

   Temperature: 200°F

8. Emulsify milk into butter‑yolk mixture

   Slowly pour the hot milk into the butter‑yolk mixture while whisking on low speed until fully incorporated and smooth.

   Time: PT2M

9. Fold in the meringue

   Take about one‑third of the whipped egg‑white meringue and gently fold it into the batter using a spatula. Continue folding until the batter is streaky but no longer has large white pockets (≈30 folds).

   Time: PT5M

10. Divide batter into pans

    Evenly spoon roughly 340 g of batter into each prepared pan, smoothing the tops with a spatula.

    Time: PT2M

11. Bake the cake layers

    Place pans on the middle rack of a preheated 350°F (177°C) oven and bake for 28–32 minutes, or until tops are golden and a toothpick comes out clean.

    Time: PT30M

    Temperature: 350°F

12. Cool and unmold

    Allow cakes to cool in pans for 30 minutes, then run a thin offset spatula around the edges and invert onto a cooling rack. Peel off parchment.

    Time: PT30M

13. Freeze to firm

    Place the cooled layers in the freezer for at least 15 minutes to make trimming easier.

    Time: PT15M

14. Trim the layers

    Using a cake leveler or long serrated knife, trim 1–2 mm off the sides and any domed tops to create flat, square edges.

    Time: PT10M

15. Make Swiss meringue (base for buttercream)

    Combine 150 g egg whites, 300 g sugar, 2 g cream of tartar, and a pinch of salt in a heat‑proof bowl. Place over simmering water and whisk constantly until the mixture reaches 170–175°F (77–80°C) and sugar is fully dissolved (≈10‑12 min).

    Time: PT12M

    Temperature: 175°F

16. Whip the cooked meringue

    Transfer the hot meringue to the stand mixer, whisk on medium‑high until it cools to about 90°F (32°C) and forms stiff peaks (≈8‑10 min).

    Time: PT10M

    Temperature: 90°F

17. Incorporate butter

    With the mixer on low, add softened butter (400 g) a few tablespoons at a time, allowing each addition to fully emulsify before adding more. Continue until the buttercream is smooth and glossy.

    Time: PT5M

18. Optional: Heat‑smooth the buttercream

    If the buttercream feels slightly grainy, gently pass a kitchen torch over the sides of the bowl while mixing, or dip a metal spatula in hot water and smooth.

    Time: PT2M

19. Soak the cake layers (optional)

    Mix 30 ml orange liqueur with 20 ml warm milk. Using a pastry brush, lightly brush each layer with the soaking liquid.

    Time: PT3M

20. Assemble the cake – crumb coat

    Place the first layer on a cake board, spread a thin layer of buttercream over the top, then stack the second layer, repeat, and finally the third. Apply a thin “crumb coat” over the entire cake to lock in crumbs.

    Time: PT8M

21. Chill crumb‑coated cake

    Refrigerate or freeze the crumb‑coated cake for 15‑20 minutes until the frosting firms.

    Time: PT20M

22. Final frosting layer

    Apply a generous, even layer of Swiss buttercream over the top and sides. Smooth with an offset spatula, then use a cake smoother held at ~45° while turning the cake wheel.

    Time: PT10M

23. Decorate

    Pipe a simple border or decorative design using a piping bag and tip of your choice. Optional: add sprinkles or edible pearls.

    Time: PT5M

24. Final chill and serve

    Place the finished cake in the refrigerator for at least 30 minutes before slicing. Use a hot, damp knife for clean cuts.

    Time: PT30M

Nutrition Facts

Calories

450

Protein

5 g

Carbohydrates

55 g

Fat

22 g

Fiber

1 g