Sift the flour.
To the sifted flour add granulated white sugar, salt, egg yolks, sour cream, baking powder and oil.
First mix all the ingredients with a large spoon. Once the dough starts to form, you can use a kneading hook or knead by hand. This is a small amount of dough so you can use your hand.
Once the ingredients are well incorporated and the dough is sort of crumbly, than this type of dough is ready. I used a lined with parchment paper 9 inch spring form pan.
Divide the dough into 2 pieces. One should be 3/4 for the bottom of the pan and the other 1/4 will be used as a crumble for the top.
Use a spoon to spread the 3/4 of the dough to the bottom of your pan and set aside. No need to refrigerate this type of dough.
Now, peel your apples, core them, and grate them on a large mesh of a grater.
If the apples are too watery / juicy you can squeeze the access juice and drink it. You can also place some bread crumbs on the bottom of the pan to absorb moistue.
Now squeeze juice of 1 lemon and pour over the apples to prevent from darkening.
Add sugar, if apples are sour. No need to add sugar if the apples are sweet.
Sprinkle cinnamon on the dough and add the shredded apples on top.
Now make a crumble from the remaining dough an spread it all over the top.
Place the apple cake into a preheated oven at 350 degrees Fahrenheit or 180 degrees Celsius for approximately 30 - 40 minutes until the top is golden brown. Oven temperatures do vary.
Once baked, let it cook for about 20 minutes.
Enjoy and Smacznego!