Preheat oven to 350 F (175 C). Line a cake tin with parchment paper and butter/oil/non-stick spray.
Beat eggs and granulated sugar together until light in color and doubled or tripled in size. Use a stand mixer with a whisk attachment, or an electric hand mixer – it will be more difficult to whisk by hand, but it can be done!
Add vanilla extract and give it another few whisks to combine.
Mix together the dry ingredients (flour, coconut, baking powder, salt) in a separate bowl.
Mix together the wet ingredients (vegetable oil and milk) in a separate bowl.
Add half of the dry ingredients to the egg and sugar mixture and mix together until just incorporated. Then add half of your wet ingredients and mix until incorporated. Add the remaining dry ingredients, mix, then add the remaining wet ingredients. Once incorporated, give the mixture a few folds with a spatula to make sure everything from the bottom has been mixed.
Next, toss your cubed apple with a tbsp of flour, then add to the cake mix.
Pour this into your cake tin, arrange the thinly sliced apple carefully on top in a circular pattern, and top with a sprinkle of sugar and coconut flakes.
Bake for 35-40 minutes or until a cake tester/skewer/knife comes out clean. Enjoy!