Preheat your oven to 350°F (175°C) and grease an 8-inch round cake pan.

In a large bowl, whisk together sugar and melted butter until well combined. Add eggs one at a time, mixing well after each addition. Gradually stir in milk until smooth.

In another bowl, sift together flour and baking powder. Gently fold this mixture into the wet ingredients until just combined.

Carefully fold in the sliced apples until they are evenly coated in batter.

Pour the batter into the prepared pan and bake for 45-50 minutes or until a toothpick inserted into the center comes out clean.

Allow to cool slightly before serving warm with whipped cream or ice cream.