Preheat your oven to 350°F (180°C). Grease a 9-inch (22 cm) cake pan.
In a bowl, whisk together the flour, baking powder, cinnamon, and nutmeg.
In a separate bowl, beat the eggs with the sugar until light and fluffy. Stir in the pumpkin puree and vanilla extract.
Melt the butter and add it to the egg mixture. Gradually sift in the dry ingredients, gently folding 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 it cool completely.
Make the frosting: Whip the heavy cream until stiff peaks form. Gently fold in the mascarpone cheese and a little sugar to taste.
Slice the cake horizontally into two layers. Spread the mascarpone cream filling between the layers and frost the top and sides of the cake.
Garnish the cake with pumpkin slices or a dusting of cinnamon. Chill for at least 2 hours before serving.
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