Heat the oven to 170°C (150°C fan). Wrap the outside of a 23cm springform tin in foil.
Mix the crushed graham crackers/digestives with the melted butter. Add the water a teaspoon at a time until a pinch holds together when squeezed. Press firmly into the base of the tin with the bottom of a glass, especially at the edges.
6 graham cracker sheets, 1.5 tbsp butter, water
Bake the crust for 8 minutes, then chill it for 10 minutes so it firms up.
Turn the oven down to 160°C (140°C fan).
Blend the cottage cheese on its own until completely smooth. Give it longer than you think; this step decides the texture.
16 oz low-fat cottage cheese
Add the cream cheese, pumpkin purée and Greek yogurt, and blend until smooth.
8 oz fat free cream cheese, 15 oz can pumpkin purée, ½ cup 0% Greek yogurt
Add the sweetener, cornflour, vanilla and spices, and blend again.
¾ cup brown sweetener, 3 tbsp cornflour, 1 tbsp vanilla extract, 1 tsp cinnamon, ½ tsp ground ginger, ¼ tsp nutmeg, Pinch of ground cloves
Add the eggs and blend on low just until combined.
3 large eggs
Pour the filling over the back of a spoon onto the crust so the base doesn't shift.
Set the tin in a roasting tin and pour in hot water about halfway up the sides.
Bake for 60–75 minutes, until the edges are set and the centre wobbles in a 5–7cm circle.
Turn the oven off, prop the door ajar and leave the cheesecake inside for 30 minutes.
Cool on the counter until barely warm, then refrigerate uncovered overnight. Cover once fully cold.
Release the tin and slice with a hot, dry knife. Top each slice with whipped cream and a dusting of cinnamon.
To serve: light whipped cream and a dusting of cinnamon