Preheat your oven to 350°F (180°C) to ensure it reaches the correct temperature while you prepare the batter.
In a mixing bowl, whisk the eggs and sugar together until light and fluffy. You can use a whisk or an electric mixer for this step.
Add the oil, milk, and vanilla sugar to the egg mixture and mix well until combined.
Zest the lemon directly into the batter. Then, stir in the chopped fresh basil.
In a separate bowl, combine the flour, baking powder, and a pinch of salt. While sifting isn't essential, it helps prevent lumps in the batter.
Gradually add the dry ingredients to the wet ingredients, mixing continuously until you have a smooth, lump-free batter.
Divide the batter evenly among the muffin cups, filling each about 2/3 full to allow room for expansion during baking.
Bake the cupcakes for 20-25 minutes, or until a toothpick inserted into the center comes out clean. They should be lightly golden brown on top and spring back lightly when touched.
Once the cupcakes have cooled completely, prepare the frosting. Whip the heavy cream until stiff peaks form, then add a squeeze of lemon juice to enhance the flavor.
Frost the cooled cupcakes with the whipped cream using a spoon or piping bag, then garnish with a fresh basil leaf or two.
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