Make a batter from the first seven ingredients. Grease a springform pan (26 cm). Bake for 30 minutes at 170 ° C.
Place the cooled base on a cake plate. Hollow out 1/2 cm deep with a tablespoon, leaving an edge of 2 cm. Roughly chop the crumbs in a bowl. Peel the bananas and cut them in half lengthways and lay them flat on the hollowed-out bottom.
Beat the cream with the cream stiffener until stiff. Fold in the chocolate flakes. Spread the cream on the bottom like a dome and sprinkle with the pastry crumbs. Put the cake in the fridge for about 2 hours.