Prepare Crust: Mix crushed biscuits with melted butter and sugar. Press firmly into a 4–5 inch pan. Bake for 6 minutes and let it cool.
Mash Durian: Mash durian pulp until smooth. If using frozen durian, thaw fully and drain excess liquid.
Make Filling: Beat cream cheese until smooth. Add condensed milk, then fold in mashed durian, lemon juice, vanilla, and salt. Mix gently. Add the egg last and fold carefully.
Pour & Bake: Pour filling over cooled crust. Tap lightly to remove air bubbles. Bake at 300°F (149°C) for 25–28 minutes, until the center jiggles slightly.
Cool & Chill: Let cheesecake cool at room temperature, then chill in fridge for at least 3 hours (or overnight).
Serve: Slice and serve chilled. Optionally, top with fresh durian, whipped cream, or a drizzle of condensed milk.