Grind the oat biscuits into fine crumbs.
Mix crumbs with melted butter, walnuts and cinnamon. Press into a lined springform pan and refrigerate.
Beat eggs and sugar briefly until combined.
Add labneh, cream, vanilla and salt. Mix on low speed until smooth.
Add flour and mix briefly.
Pour the filling over the biscuit base.
Bake at 320°F / 160°C for 45 to 55 minutes, until the edges are set and the center wobbles slightly.
Let the cheesecake rest in the turned-off oven for 20 minutes, then cool at room temperature.
Cook pumpkin with sugar and water until soft.
Blend the pumpkin, then add cinnamon and lemon juice. Cool the purée.
Spread the pumpkin purée over the cheesecake.
Refrigerate overnight.
Decorate with walnuts, cinnamon or tahini before serving.