Preheat the oven to 190C/Gas 5; melt the butter in a large pan and stir in the oats, almonds, flour and sugar; press the mixture firmly into an 18cm round, loose-based cake tin; bake in the oven for 20 minutes; cool in the tin
Mash the bananas in a large bowl; add the ricotta, banana yoghurt, chopped chocolate and sugar and mix well
Sprinkle the gelatine over 3 tbsp of water and leave it to soak; heat up in the microwave for 10 seconds; stir until the gelatine dissolves; allow to cool slightly and stir into the banana mixture; pour over the base and chill overnight
Carefully remove the cheesecake from the tin; transfer to a serving plate and decorate with the sliced bananas and strawberries; scatter the grated chocolate over the top and serve
6 servings