Preheat the oven to 350 degrees Fahrenheit or 180 degrees Celsius
Melt butter, but be careful not to burn it. Cool it off for about 5-10 minutes.
In the meatime, peal and cut the apples into thin slices and sprinkle them with some lemon juice. Set the apples aside.
In a seperate bowl, add eggs, sour cream, sugar, and mix them all together with a spoon.
Add the melted butter, vanilla, lemon zest, and continue mixing.
Add a table spoon of sparkling water and mix.
Measure about two cups of flour, and add two tea spoons of baking powder to the flour with a pinch of salt. Mix it well together and then pour into the bowl with the other ingredients.
Mix all the ingredients together with a spoon.
Add half of the apples and mix them into the batter, gently.
Pour out the batter onto a greased and lightly breaded round baking dish.
Place the other half of the apples on top of the batter.
Bake for 40-45 minutes until golden.
Cool it off for about 10 minutes, sprinkle some powdered sugar on top, and Enjoy!