Preheat your oven to 350°F (180°C). Line a 8-inch (20 cm) cake pan with parchment paper.
In a bowl, whisk together the flour, baking powder, and cinnamon.
In a separate bowl, cream together the butter and sugar until light and fluffy. Add the eggs one at a time, mixing well after each addition.
Stir in the vanilla extract and milk, then gradually add the dry ingredients, mixing until just combined.
Pour the batter into the prepared cake pan and bake for 30-35 minutes, or until golden brown and a toothpick inserted into the center comes out clean. Let cool in the pan for 10 minutes before transferring to a wire rack to cool completely.
For the frosting, combine the mascarpone cheese, heavy cream, and powdered sugar in a bowl. Beat until light and fluffy.
Slice the cake horizontally into two layers. Spread half of the frosting over the bottom layer, then top with the second layer. Frost the top and sides of the cake with the remaining frosting.
Dust the cake with cinnamon and refrigerate for at least 2 hours to allow the flavors to meld.
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