Preheat your oven to 350°F (180°C). Grease and lightly flour a Bundt pan.
In a large bowl, cream together the butter, sugar, and vanilla sugar until light and fluffy.
Add the eggs one at a time, mixing well after each addition.
Stir in the orange juice, orange zest, and milk until smooth.
In a separate bowl, whisk together the flour, rolled oats, baking powder, and a pinch of salt.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Pour the batter into the prepared Bundt pan and smooth the top.
Bake in the preheated oven for 40-45 minutes, or until a wooden skewer inserted into the center comes out clean.
Let the Bundt cake cool in the pan for 10 minutes, then invert it onto a wire rack to cool completely.
Dust with powdered sugar before serving.
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