Preheat your oven to 350°F (180°C) to ensure it reaches the optimal temperature while you prepare the batter.
In a mixing bowl, whisk together the eggs, granulated sugar, and vanilla sugar until light and fluffy. You can use a hand whisk or an electric mixer.
Add the vegetable oil, milk, and Limoncello liqueur. Mix well until you have a homogeneous mixture.
In a separate bowl, combine the all-purpose flour, baking powder, and salt. Gradually add this dry mixture to the wet ingredients, mixing continuously to avoid lumps.
Zest the lemon and fold it into the batter to impart a fresh, citrusy flavor to the cupcakes.
Divide the batter evenly among the muffin liners, filling each about 2/3 full to allow room for rising.
Bake the cupcakes for 20-25 minutes, or until a toothpick inserted into the center comes out clean. The cupcakes should be golden brown on top.
Let the cupcakes cool completely before frosting.
Whip the heavy cream until stiff peaks form. Gradually add the powdered sugar and a splash of Limoncello liqueur for a subtle alcoholic flavor.
Pipe or spoon the frosting onto the cooled cupcakes and garnish with lemon zest.
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