01 -
Make sure everything’s warm, room temp makes things mix better. Set the oven to 175°C. Grease and flour a 23 cm loaf pan, then put it aside.
02 -
Grab a big bowl and whip the softened butter with granulated sugar on medium speed with an electric mixer. Keep going for 3 to 5 minutes until it’s fluffy and lighter in color.
03 -
Pour in the eggs and yolks little by little, mixing well after each one. Throw in the vanilla extract and blend it all smooth.
04 -
Sift the all-purpose flour, cake flour, baking powder, and salt together in a bowl. This stops lumps and spreads out the baking powder nicely.
05 -
Add the dry flour mix into the butter blend in three parts. Between these, add the milk and Greek yogurt twice. Always start and finish with the dry stuff and stir gently to not overwork the batter.
06 -
Use a spatula to gently mix the rainbow sprinkles into the batter. Be careful so the colors don’t bleed.
07 -
Pour your batter into the loaf pan and smooth the surface. Bake for about an hour at 175°C until a toothpick comes out clean.
08 -
Let the cake chill in the pan for 15 minutes. Then move it to a wire rack and cool it completely before putting on the glaze so it doesn’t melt.
09 -
Whisk together powdered sugar, the leftover Greek yogurt, and heavy cream or milk until smooth. Pour it over the cooled cake and let it set.