Put 600 g flour, baking powder, butter in flakes, salt, 175 g sugar and 2 eggs in a bowl. Knead first with the dough hooks of the hand mixer, then with your hands to a smooth short pastry.
Wrap approx. 2/3 of the dough in cling film, chill for approx. 30 minutes. Knead the remaining dough with 75 g flour and cranberries to form crumbles.
Stir sour cream, 4 eggs, milk, calvados, pudding powder and 75 g sugar until smooth. Peel and quarter apples, remove core. Cut quarter into thin slices. Sprinkle with lemon juice.
Roll out the short pastry on a floured work surface until round (approx. 34 cm Ø). With the help of the dough roller, place the dough in a greased and flour-sprinkled springform pan (26 cm Ø). Press down the rim.
Pour apples on top, pour a sand glaze over it and spread crumbles on top. Bake in the preheated oven (electric cooker: 175 °C/ convection oven: 150 °C/ gas: see manufacturer) for approx. 1 hour on the bottom shelf.
Cover with aluminium foil after about half the baking time. Take out and let it cool down on a cake rack.