Grease a 23×23 cm heat-resistant square mold with oil.
In a bowl, combine the crumbled biscuits with the melted butter. Put this mass in the prepared form and tamp well with the bottom of the glass cup. You should get a dense crust.
Prepare the creamy filling. Beat the cream cheese with sugar at a slow speed. Add starch, lemon curd, and egg, mix well. Put this filling on the prepared crust, distribute evenly.
Place the mold in a preheated oven. Bake the cheesecake for 25-30 minutes.
Remove the finished cake from the oven, let it cool completely, and then cut the cheesecake into squares.