Wash the apple thoroughly, peel it, and slice it thinly.
Coarsely chop the almonds.
In a bowl, mix together flour, sugar, baking powder, and salt.
Add eggs, milk, and butter, and mix until well combined.
Add the apple and almonds to the batter and mix well.
Pour the batter into a loaf pan and smooth out the surface.
Bake in a preheated oven at 180°C (356°F) for 35-40 minutes.
Let cool and cut into desired sizes.