Preheat the oven at 180°C and grease the Bundt pan with butter and flour.
In a bowl mix the butter and sugar until smooth and creamy. Add the eggs one at a time and the vanilla sugar. Add the yogurt and orange juice.
In a separate bowl whisk the dry ingredients: flour, baking soda, baking powder, pinch of salt, orange zest.
Add the dry ingredients to the wet ones while mixing at low speed.
Once everything is combined, pour the batter into the pan and bake for 50 minutes, you can do the test with the toothpick.
After it's baked remove it from the oven and let it cool for 10 minutes in the pan, after that invert the pan and the cake will drop.
You can serve it as it is or make a glaze with powdered sugar and orange juice or milk.