Preheat your oven to 350°F (175°C). Grease a cake pan and set aside.
In a mixing bowl, whisk together the flour, sugar, cinnamon, nutmeg, allspice, and clove until evenly combined. This creates a fragrant spice mixture that will flavor the batter.
In another bowl, beat the eggs with melted butter, vanilla extract, and your secret ingredient until smooth and slightly frothy.
Pour the wet mixture into the dry ingredients and gently fold until just combined, creating a thick batter.
Slice the peeled apple into thin wedges and carefully fold them into the batter, ensuring they are coated evenly and distributed throughout the mixture.
Pour the batter into the prepared cake pan, spreading it evenly with a spatula. Arrange some apple slices on top for decoration if desired.
Bake in the preheated oven for about 40 minutes, or until the top is golden brown and a toothpick inserted into the center comes out clean.
Once baked, remove the cake from the oven and let it cool in the pan for 10 minutes before transferring to a wire rack to cool completely.
Slice into squares and serve the warm, fragrant cake, highlighting the tender apples and flavorful spice infusion.
