Chop the chocolate and melt it in a double boiler.
Beat eggs and sugar until frothy. Stir in chocolate and butter. Mix the flour, starch, baking powder and salt, add and stir briefly. Add the chopped walnuts.
Use a teaspoon to place small heaps of the mixture about 4 cm in diameter on a baking sheet.
Bake at 180 ° C on the middle shelf for 10 - 12 minutes. The cookies are still soft and get harder when they cool down.