In a bowl, mix the yogurt with the sugar and vanilla sugar, add the melted butter and incorporate one egg at a time.
Gradually add the flour, continuing to mix until there are no lumps, finally add the salt powder, baking powder, and orange essence.
Mix for 1 more minute.
Transfer the mixture to a greased baking tray and bake in a preheated oven at 180 C for 35-40 minutes.
Remove and let the cake cool completely.
For the glaze.
Melt the chocolate in a double boiler or in the microwave, add the squeezed orange juice, mix, pour the glaze over the cake, add orange slices if desired.
