Add flour, 1 cup at a time, mixing well after each cup. Add more flour, if necessary, to make a smooth dough, and turn out onto a floured surface. You can either mix it in a bowl like I showed up above or you can mix it in a mixer.
Knead very lightly.
Let rise for about 1 hour; punch down and let rest for 10 minutes. Meanwhile prepare apple and custard toppings.
Apple Topping
4 medium sized apples
1/3 C. vanilla sugar
2 teaspoons cinnamon
I used 4 apples 2 semi-tart red skin apples, these were Fuji, and 2 tart Granny Smith apples. I did this just to give a variety of flavor.
Peel and core apples, then cut into ¼ inch slices.
Spread dough in 2 well-greased 9-inch round or square cake pans, pushing it up on the sides as for pie crusts.
Stagger the apples in rows(or in random fashion if in a hurry) on top of dough. Drizzle melted butter over the fruit and crust, sprinkle with cinnamon and sugar. Let the dough rise for 30 minutes.
Bake for 10- 15 minutes at 375 degrees to set the crust. Remove from oven.
Custard Topping
add the egg, sugar, vanilla into the cream or milk- sour cream blend and mix well.
Srreusel Topping
1/2 cup (75 gr) Bread Crumbs or Flouror combination 1/4 cup Sugar 1-2 teaspoons (10 gr) Cinnamon3-6 tablespoons (28 gr) melted Butter Streusel is a flexible garnish. Some like it drier, some like it sweeter.
Mix which ever streusel you like.
Last Steps
Top first with the custard.
Take the Streusel you chose to use and sprinkle as much as you want on top.
Continue baking at 350° for 30 minutes longer. The custard is set and the apples are completely cooked. It will have an internal temp. of 200- 210 degrees when done.
Cool and cut in squares and serve topped with whipped cream.
Notes
Store in fridge, this cake
gets better after a day. It will keep for a week at least properly stored.