Preheat your oven to 350 degrees F and line a 9 inch springform pan with parchment paper, set aside.
In a large mixing bowl whisk your eggs for 2 minutes.
Add your sugar and vanilla extract, beat again on high speed for another 10 minutes or until the mixture triples in size and forms thick and fluffy ribbons.
Using a sifter, sift your flour, baking powder, and salt in 3 separate additions, folding with a spatula in between of each addition.
Add ⅔ of your diced apples and gently fold them in.
Transfer the batter into your prepared spring form and top with your remaining diced apples.
Bake for about 40-45 minutes or until a toothpick inserted in the center comes out clean.
Allow to cool in your pan for at least 10 minutes.
Slide a thin knife around the edges to loosen the cake. Transfer the cake to a cool rack to cool completely. Top with powdered sugar if desired, slice and enjoy!
