Preheat the oven to 350ºF (180ºC). Butter a 9-inch (23 cm) springform pan.
In a food processor, combine the flour and confectioners’ sugar. Add the butter and pulse. With the machine running, add the egg to form a soft dough.
Using your hands, press the dough into the bottom and up the sides of the prepared pan.
Place the apple slices on the bottom of the pastry and up along the sides. Sprinkle the cinnamon on top of the apples.
Whisk together the heavy cream, granulated sugar, eggs, and vanilla until combined then pour over the top of the apples.
Bake for 1 hour or until the crust is golden and the filling has set. Let the cake cool before serving.
