Preheat oven (electric cooker: 175 °C/circulating air: 150 °C/gas: see manufacturer). Grease a square springform pan (24 x 24 cm; alternatively round, 26 cm Ø) and dust with flour. Chop the almonds.
Wash the pumpkin and apple. Cut pumpkin into slices and remove seeds. Grate pumpkin and apple roughly. Cream 200 g butter and 200 g sugar with the whisk of the mixer. Stir in eggs one after the other.
Mix 175 g flour, 1 pinch of salt and baking powder. Alternate with sour cream and stir into the butter-sugar cream. Stir in almonds, pumpkin and apple.
Put the dough into the mould and smooth it down. Bake in a hot oven for about 1 hour (chopstick test!). Take out and let cool in the tin. Carefully remove from the tin and let it cool down.
In the meantime, mix cream cheese, icing sugar and cream. Spread the cream on the cooled down cake. Cut into pieces.