Beat the butter and sugar until frothy. Gradually add eggs, then add salt. Stir in the flour and milk, sifted with baking powder, alternately. Divide the dough into 2 halves, fold into one half of the nut nougat cream and the other half of the egg liqueur.
Grease a bundt pan or springform pan (28 cm) and sprinkle with breadcrumbs. Pour in the light dough, pour over the dark dough and mix both types of dough with a fork. Bake in the preheated oven at 175 ° C (middle rack) for about 60 minutes. Make a chopstick test.
Let the cake cool down a little, turn it out onto a cake plate and dust with powdered sugar just before serving.