1. Preheat your oven to 350°F (180°C) and line a loaf pan with parchment paper.
2. In a large mixing bowl, whisk together whole eggs, powdered sugar, and vanilla extract until smooth.

3. Add the milk and melted unsalted butter to the mixture and whisk again. Gradually add the dry ingredients (flour, baking powder, and a pinch of salt) to the wet mixture, constantly whisking until the cake batter is smooth.

4. Peel the apples, then thinly slice them using a vegetable peeler. Discard the peels and fold the apple slices into the batter.


5. Pour the apple mixture into the prepared pan and spread it evenly. Flatten the top of the cake using a rubber spatula or a spoon to gently press down any apple slices that stick out.

Bake for 1 hour, until lightly golden brown and a toothpick inserted into the center comes out clean.
6. Let the apple cake cool in the pan for a little bit, about 10-15 minutes, then carefully transfer it to a wire rack to cool completely. Once fully cooled and set, sprinkle with powdered sugar before serving.

7. Slice and enjoy!