Rainbow Birthday Cake
Six pastel layers in pink, orange, yellow, green, blue and purple, with vanilla buttercream and rainbow sprinkles.
Recipe in testing: I'm cooking it in my TM7™ and will update the steps and the photo with my own.
Cut into this cake and the whole party says wow: six thin layers in pastel pink, orange, yellow, green, blue and purple, stacked with vanilla buttercream and finished with white frosting, a piped border and rainbow sprinkles. It takes some time, but every step is simple, and it is a birthday cake people remember.
The Thermomix® TM7™ mixes one white cake batter made with egg whites, which keeps the colors clean and bright. You weigh it, divide it among six bowls and tint each one with a touch of gel coloring. The thin 6 inch layers bake in about 15 minutes, two or three at a time, and then the TM7 beats the buttercream.
Made in the Thermomix® TM7™
Rainbow Birthday Cake
Makes: 1 cake, 15 cm (6 in) wide, six layers (12 slices)
- Prep1 h 15 min
- Cook35 min
- Total3 h 30 min
- Serves12
Ingredients
White cake
Vanilla buttercream
To decorate
Instructions
- Preheat the oven to 180°C (350°F). Grease your 15 cm (6 in) round cake pans, ideally 3, and line the bottoms with parchment paper.
- Place the flour, sugar, baking powder and salt in the mixing bowl and mix 10 sec/speed 4. Add the butter and mix 30 sec/speed 4, until it looks like damp sand.
- Add the egg whites, milk and vanilla and mix 20 sec/speed 4. Scrape down the sides and mix 10 sec/speed 4, until smooth.
- Weigh the batter and divide it evenly among 6 bowls, about 190 g each. Tint each bowl a pastel color with a tiny dab of gel coloring and stir with a spoon until even.
- Spread each color in a prepared pan and bake in the oven for 14 to 17 minutes, until the top springs back and a toothpick comes out clean. Bake in rounds if needed, cooling and lining the pans again between rounds. Cool the layers 5 minutes in the pans, then on a rack until completely cool.
- Wash and dry the mixing bowl. Place the butter in it and mix 1 min/speed 4. Add the powdered sugar and salt and mix 30 sec/speed 3, then add the cream and vanilla and mix 1 min/speed 4, scraping down halfway.
- On a cake stand, stack the layers starting with purple, then blue, green, yellow, orange and pink, with a thin layer of buttercream between each. Spread a thin coat all over and refrigerate 20 minutes.
- Cover the cake with most of the remaining buttercream and smooth it. Pipe a border of swirls around the top edge with a star tip and scatter rainbow sprinkles over the top.
Tips
- Pastel layers need very little gel coloring: start with the tip of a toothpick and add more only if the color looks too pale.
- If you only have one or two pans, the batter can wait at room temperature while the first layers bake.
- Bake the layers a day ahead, wrap them well once cool and keep them in the refrigerator; cold, thin layers are much easier to stack.
- Keep the cake covered in the refrigerator up to 3 days and take it out 1 hour before serving.
