Add the first five ingredients to the mixer bowl and mix using the flat beater, until fluffy. Then add the eggs one at a time. Add the flour and before it is fully combined in the mixture add walnuts and chocolate drops as well; combine all ingredients. Roll the dough into round shapes with a pastry bag fitted with a plain round tip on a metal sheet, which you have lined with baking paper and bake in a pre-heated hot air oven at 160-170°C for 15 minutes.