Preheat oven to 350°F (175°C). Line two baking trays with parchment paper.

In a large bowl, mix together topfen, egg, milk, oil, sugar, vanilla and lemon zest. Add flour, baking powder and salt and mix to combine. Knead the dough on your work surface with your hands shortly to smooth it out and ensure flour is well distributed.

Melt the butter and set aside.

Flour your work surface and rolling pin and roll the dough out to slightly more than ¼ inch thickness (0,75 cm). Using the bunny cookie cutter, cut out bunnies and lay them on the parchment paper lined baking tray. Repeat the process until the dough is used up. Use the dough scraps to make dough balls for the bunny tails. Dip the tails in milk and glue them onto the bunnies.

Brush the bunnies with the melted butter. Bake for 7-9 minutes, just until the edges start to brown.

Remove bunnies from the oven, brush with melted butter again and immediately sprinkle with white or colored sugar. Allow bunnies to cool completely on a wire rack. The bunnies are best eaten within two days before they dry out. Store cooled bunnies in an airtight container.