Spread the wafer cups with some distance on a baking tray lined with baking paper. Cream butter, sugar, vanilla sugar and 1 pinch of salt with the whisk of the mixer. Stir in the eggs one after the other. Mix the flour and baking powder and stir in the milk briefly, alternating with the flour.
Pour the dough in portions into a piping bag and squirt into the wafer cups. Bake "ice" muffins in a preheated oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer) for 16-18 minutes. (During this time, the chocolate inner glaze melts and partially runs down the edge of the waffle). Carefully remove the cakes from the oven, place them on a cake rack and let them cool down.
For the decoration, chop the entire couverture and melt in a hot water bath. Leave to cool a little. Dip the cake upside down, drain a little and let the icing dry a little. Decorate with the various toppings. Leave to dry.
For filling, fill a piping bag with muffin dough and squirt it into the wafer cups up to about 1 cm below the edge.
To decorate Fill all crumble toppings in small bowls. Gently press the cake with the still slightly moist chocolate icing into the crumbles so that the "ice ball" is decorated all around.