For the shortcrust 250 g flour, 75 g sugar, 125 g butter in pieces and 1 egg, first with the dough hook, then quickly knead with your hands to a smooth dough. If necessary, knead in 1-2 tablespoons of cold water.
Grease a spring plate (bottom 26 cm Ø; top 28 cm Ø). Roll out approx. 2/3 of the dough to the size of the base and place in the mould. Roll the remaining short pastry into a long strand. Place on the edge and press up to a flat rim.
Prick the bottom several times with a fork. Place the mould in a cool place for about 30 minutes.
Mix 300 g blueberries with 2 tablespoons of flour in a bowl and place in the refrigerator. Mix 150 g blueberries with jam, set aside. Bake in a preheated oven (electric cooker: 200 °C/ circulating air: 175 °C/ gas: see
manufacturer) 12-15 minutes pre-baking. Remove and let cool on a cake rack. For the batter, whisk 250 g butter and 250 g sugar until creamy. Stir in 4 eggs one after the other.
Mix 350 g flour and baking powder. Alternately stir in crème fraîche, lemon peel and lemon juice. Briefly fold in blueberries mixed with flour.
Fill the dough into the form, smooth it down. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: see manufacturer) for 45-50 minutes (stick test). Remove and let cool on a cake rack.
Roast the flaked almonds in a pan without fat, take them out and let them cool down. Mix 100 g butter with icing sugar until creamy. Stir in cream cheese bit by bit. Remove the cake from the pan. Spread with the cream.
Spread blueberry jam in blobs on top. Sprinkle with flaked almonds.