Mix all ingredients together until the dough is crumbly.

Add egg and continue mixing. Do not over mix the dough. It just needs to have a consistency of being able to roll out the dough.

If dough appears too dry, add 1 tbsp yogurt or sour cream.

If dough appears too wet, add 1 tbsp flour.

Roll the dough out on a flat, floured surface to the size of the pan (approx 9x13 in size). Transfer to the pan.

Using a clean and dry mixing bowl, add the egg whites and mix on medium speed for 2-3 minutes. Then switch to high speed until egg white peaks form.

Transfer egg whites to a separate bowl and put aside for time being.

Add the egg yolks with sugars to the mixing bowl and mix on medium speed for 5 minutes. When creamy in texture, add yogurt and continue mixing.

Reduce speed to low, add powdered pudding and flour and cinnamon. Mix just until combined.