In a large bowl, whisk together the flour, baking powder, and vanilla sugar.
Cream together the softened butter and sugar until light and fluffy. Add the eggs one at a time, mixing well after each addition.
Grate in the orange zest, squeeze in the orange juice, and stir into the butter-egg mixture.
Gradually add the flour mixture, then pour in the milk and mix until a smooth batter forms.
Pour the batter into a greased and floured Bundt pan, then smooth the top.
Bake in a preheated oven at 350°F (180°C) for 40-45 minutes, or until a toothpick inserted into the center comes out clean.
Let the Bundt cake cool slightly in the pan, then carefully invert it onto a wire rack to cool completely.
Before serving, you can dust with powdered sugar or drizzle with orange glaze.
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