This Kuchen entices with a salty-sweet crust and a light custardy cinnamon-spiced apple filling.
Make the crust: Preheat oven to 375 degrees. Whisk flour, baking powder, sugar, and salt in a large bowl. Using your fingers, work in butter until just incorporated. Press into a 9-inch pie plate.
Make the filling: Stir sugar and cinnamon in a small bowl. Arrange apple evenly over crust, overlapping if necessary. Sprinkle with cinnamon-sugar.
Bake 15 minutes. Whisk together half-and-half and eggs. Raise oven temperature to 400 degrees. Pour egg mixture over apples. Bake until set, about 20 minutes. Let cool on a wire rack at least 1 hour.