Pre-heat oven to 180 °C / 360 °F
Prepare a 9X13 inch loaf pan. Line with a double layer of parchment paper.
Core and peel apples. Cut into small chunks. Toss with 2 tablespoons all-purpose flour and 1 teaspoon of cinnamon powder.
In a mixing bowl add Flour, Baking Powder, Baking Soda, Cinnamon Powder, Nutmeg, Salt. Whisk well.
In another bowl add eggs, oil, yoghurt, Vanilla Extract, Light brown sugar and white sugar. Whisk well until everything is mixed and the mixture looks smooth.
Add dry ingredients mixture in two parts. Mix using a spatula until the dry ingredients are incorporated. Don't overmix.
Add coated apples and walnuts to the flour and carefully fold using a spatula.
Put the batter in the prepared container. Bake at 180 °C / 360 °F for 20 minutes then reduce the temperature to 160 °C / 320 °F and bake for another 30 minutes.
Insert a knife to check if it is done. Remove and let it rest on the counter for 10 minutes.
Using a knife loosen the edges and flip to a wired rack.
Let it cool completely before slicing.