Place paper cups in the recesses of the muffin baking tray (12 pieces). Preheat the oven (electric cooker: 175°C/circulating air: 150°C/gas: level 2). Wash the lime, rub dry and grate the peel.
Squeeze the juice.
Mix flour, baking powder and baking soda. Separate 3 eggs. Whisk 1 egg and egg yolk in a mixing bowl. Add brown sugar, 1 vanilla sugar, 1 pinch of salt, lime zest, oil, 3 tsp lime juice and milk and mix well with a wooden spoon.
Add flour mixture and stir in. Spread the dough evenly into the tins and bake in a hot oven for 20-25 minutes.
Beat the egg whites until stiff, adding 150 g sugar. Remove the muffins from the oven, place the beaten egg whites on top and bake at the same temperature for another 8-10 minutes. Let them cool down.
Mix cream cheese, 75 g sugar, 2 tablespoons lime juice and 1 vanilla sugar briefly. Cut off one lid from each muffin. Spread lime cream on the lower muffin halves and smooth it down.
Put the lid back on. Dust with icing sugar.