Before we make the batter there are a couple things to prepare. Preheat a fan-forced oven to 120°C (250°F) or a conventional oven to 140°C (275°F). Line two cupcake tins with white cupcake liners. My cupcake liners are greaseproof cupcake liners from a Sydney based brand named Confetta. They measure bottom: 5cm, height: 4cm, top: 7.5cm. The cupcake tin I use is from a brand named Willow. Any brand will do. The measurements of the cupcake tin I use is, bottom: 5.5cm, height: 3cm, top: 7cm. Spray a 12-cavity cake donut baking tin with oil spray, use a paper towel to gently wipe down the tin and spread the oil spray around evenly. The donut tin tray that I use measures: 7.5cm in diameter and 2cm in depth. It’s important you don’t use a donut tray that is larger in diameter than the diameter of the top of your cupcakes, otherwise your finished cupcakes will look unbalanced and odd. Either use the same donut tray measurements as me (if you can) or use it as close as you can. Slightly under is better than larger than the one I use.
Add the flour, sugar, baking powder and salt to a large mixing bowl and mix with a hand mixer (or stand mixer) until well combined.
Next, add the softened butter and mix on low speed until the mixture reaches a crumbly, sand-like texture.
Add the eggs, milk, oil, yoghurt, strawberry flavouring, white food gel and vanilla extract, and mix on low speed until all the dry ingredients are incorporated. Scrape down the side and bottom of the bowl and mix for a final 20 seconds.
Split the mixture into 6 mixing bowls. Colour each bowl the colour of the rainbow. Mix using a spatula or spoon until evenly mixed. Add each coloured batter to a piping bag. Snip a very small bit off the end. It’s really important you snip off only a very small bit off the end because it will make piping into the donut tray much, much easier.
Let’s begin by piping batter into the donut tray. We will be piping one donut at a time and will be making 8 donuts in this recipe. Pipe a thin line of orange batter on one side of donut cavity, quickly followed by the yellow next to it, then green, blue, purple and the pink all the way on the other end of the donut. Go back over the rainbow with the coloured batters. You want to aim to fill each donut cavity no more than halfway. Bake for 20 minutes and then allow to cool for 10 minutes before gently tapping the tray on a kitchen towel on your work bench to get the donuts to pop out. Allow to cool on a cooling rack.
Next, let’s move onto filling the cupcake liners. You want to aim to fill the cupcake liners just over ¾ of the way. So, keep that in mind as you fill them. Begin by piping a layer of orange batter at the bottom of each cupcake liner, followed by the yellow, green, blue, purple and finish with the pink. Bake for 1 hour. Yes, 1 hour. Wanna know how I get really beautiful flat cupcakes with no browning? I bake on a low, slow temperature! The cupcakes come out a little denser, but they’re really moist and still really delicious! Once the cupcake shave baked, transfer to a cooling rack to cool down completely.