Preheat oven to 350°F (180°C). Grease and flour a 9-inch (22 cm) cake pan, then line the bottom with parchment paper.
In a large bowl, whisk together the flour, baking powder, baking soda, cinnamon, and salt.
In another bowl, whisk together the eggs, granulated sugar, and brown sugar until light and fluffy. Then, add the oil and vanilla sugar and mix well.
Gradually add the dry ingredients to the wet ingredients, mixing until just combined.
Fold in the grated carrots and ground walnuts until evenly distributed.
Pour the batter into the prepared cake pan and bake for 35-40 minutes, or until a wooden skewer inserted into the center comes out clean.
While the cake is baking, prepare the cream cheese frosting: Whip the heavy cream until stiff peaks form. In a separate bowl, combine the mascarpone cheese and powdered sugar until smooth. Gently fold the whipped cream into the mascarpone mixture.
Let the cake cool completely before frosting. Spread the cream cheese frosting evenly over the top of the cake.
Garnish with grated carrots or chopped walnuts, then refrigerate for at least 1 hour to allow the frosting to set.
Slice and serve, enjoying the delicious and spiced flavor of this carrot cake!
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