Start off by lining the cake tin with a parchment paper at the bottom and grease the sides with butter. Combine cake base ingredients: In a bowl combine flour, butter, sugar, water and a pinch of salt. Using your hands mix all the ingredients together to form a firm dough. Put the dough in the fridge while you're preparing the filling.
Preheat the oven to 180 ° C (365 °F), with both top and bottom heat. Peel the pears, remove the core and cut into slices and set aside. In a second bowl combine sugar, heavy cream, cream cheese, eggs, vanilla extract and cornstarch (cornpowder). Whisk to a smooth cream.
Place the pastry into the prepared cake tin. Don't' worry, it doesn't have to be perfect. Using your hands, press the cake base until the bottom of the cake tin is covered. Make the dough a bit high on the sides as well. Arrange pear slices on top of the cake base, pour the filling over the top and bake for 60 minutes. After 60 minutes switch off the oven. Open the door halfway and let the cake be in the oven for at least 10 minutes, so that it will become nicely golden brown. Dust with powdered sugar and enjoy!