Peel, quarter and core the apples. Halve the quarter again and cut into slices. Mix flour, baking powder and cinnamon.
Cream butter, salt and sugar with the whisk of the hand mixer. Stir in the eggs one by one. Stir in flour mixture and cream. Fold in apple pieces.
Pour the dough into a greased and flour-spread baking tin (approx. 21 x 31 cm). Bake in a preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 25 minutes (stick test).
Take out, let it cool down. Dust with icing sugar and serve hot or cold.