Preheat oven to 350°F (180°C) and grease a cake pan.
In a bowl, whisk together the flour, baking powder, and vanilla sugar.
Melt the butter and cream it together with the granulated sugar until light and fluffy. Add the eggs one at a time, mixing until smooth after each addition.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined. Pour the batter into the prepared cake pan and bake for 30-35 minutes, or until a toothpick inserted into the center comes out clean.
Let the cake cool completely. Then, slice it in half horizontally and prepare the filling. Combine the mascarpone cheese with powdered sugar and lemon juice. Gently fold in the whipped heavy cream.
Spread the mascarpone cream over the bottom layer of the cake and arrange sliced peaches on top.
Top with the other cake layer. Decorate the top of the cake with additional peach slices and dust with powdered sugar.
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