In a large mixing bowl, whisk together the flour, baking powder, and granulated sugar.
Add the cold, cubed butter and cut it into the flour mixture using a pastry blender or your fingertips until the mixture resembles coarse crumbs.
Add the egg, lemon zest, and orange zest. Mix until a smooth dough forms.
Wrap the dough in plastic wrap and refrigerate for 30 minutes to rest.
Preheat your oven to 350°F (180°C) and line a tart pan with parchment paper.
Roll out the dough and press it into the tart pan. Prick the bottom with a fork to prevent it from puffing up during baking.
In a separate bowl, whisk together the heavy cream, lemon juice, orange juice, and vanilla sugar. Pour the mixture over the dough.
Bake the tart for 30-35 minutes, or until the crust is golden brown and the filling is set.
Let the tart cool completely before slicing and serving.
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