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Preheat oven to 350F and grease a 9 inch round spring form pan.
Put the streusel ingredients in a small bowl and blend everything together with your fingertips until it has a nice even crumbly texture and there is no more raw flour. Make sure to break down any large clumps of butter. Refrigerate.
Toss the apple slices with a little lemon juice to prevent browning.
Cream together the butter and sugar until light and fluffy. Beat in the eggs, one at a time.
Whisk together the flour, baking powder, cardamom, and salt. Fold the dry ingredients into the butter/sugar mixture, along with the milk or cream.
Spoon the batter in to the pan, and smooth out evenly. Top with the sliced apples, and then the crumble topping.
Bake for about 50 minutes, until the top is lightly browned and a toothpick comes out without wet batter clinging to it. Lay a loose layer of foil over the top if the crumble is browning too quickly.
Let cool a bit in the pan before removing the sides. Dust with confectioner's sugar before serving.
To make the custard sauce bring the milk to a simmer over medium heat. Meanwhile whisk the yolks and sugar until pale. Drizzle a little of the hot milk into the egg mixture, whisking all the time. Add a little more, while whisking, then transfer that back into the pan and continue cooking, stirring constantly, until the mixture coats the back of a spoon. Don't overcook or it can curdle. Stir in the vanilla. I like to run the sauce through a strainer to catch any bits of cooked egg or lumps.
Refrigerate the custard sauce until needed.