A pretty cake covered with thin slices of apples and glazed with crab apple or apple jelly right out of the oven.

Set the oven rack at the center of the oven. Preheat the oven to 375°F (190 °C).
Butter a 9-inch (23-cm) square pan.
In a large bowl, beat butter and sugar until smooth. Add the egg and beat for 1 minute until the mixture turns pale. Scrape bowl once during this step.
In a second bowl, whisk together the flour, baking powder and salt.
Peel, core and slice the apples and reserve.
Blend half of the flour mixture and the milk into the egg mixture.
Add remaining flour and beat until smooth not more. Scrape the bowl once during this step.
Pour the batter into the pan, spread evenly and cover with the sliced apples.
In a small bowl, mix 25 g (2 tablespoons) of sugar, nutmeg and cinnamon and sprinkle over the apples. Bake in the oven for 25 to 35 minutes , until a toothpick inserted into the dough comes out clean.
In a small saucepan, over low heat, liquefy the crab apple jelly. Brush the baked cake with the jelly and let cool for about 20 minutes before serving.