To prepare this vasilopita recipe, start by dividing the eggs into yolks and whites. Place the egg whites in the your mixer bowl and add a pinch of salt. Make sure your egg whites, bowl and whisk attachments are clean and free of any water. Whisk the egg whites until the mixture is very thick and glossy and a long trailing peak forms when the whisk is lifted (meringues). Place the mixture in a bowl and set aside.

Clean out your mixer bowl and add the butter and sugar. Using the paddle hook or the creaming attachments whisk for about 20 minutes, until the butter is creamy and fluffy like whipped cream. Add the egg yolks, one at a time, whilst mixing, allowing time for each one to be absorbed, before adding the next. Pour in the orange juice, the vanilla extract, the orange zest, the yogurt and mix to combine.