Peel and slice the carrots. Beat the butter, sugar and vanilla sugar until the mixture is frothy. Mix the flour and baking powder and sift finely into the mixture. Gradually add the eggs. Carefully fold in the carrots and hazelnuts, and finally add the chocolate.
Divide the mixture into approx. 12 baking molds and bake in a preheated oven at 170 ° C top / bottom heat for 20-25 minutes.
Let the muffins cool down, mix the powdered sugar with water and lemon juice until a slightly thicker mixture is formed. Color with food coloring. Brush the muffins with the icing and decorate with sugar pearls.