Preheat your oven to 180°C (350°F). Grease your baking pan and set aside.
In a large bowl, beat the softened butter with white and brown sugars until the mixture is pale, fluffy, and fragrant, about 2 minutes.
Add eggs one at a time, beating well after each addition. You'll notice the batter becoming glossy and smooth.
Stir in vanilla extract and ground cinnamon, letting the aroma fill the kitchen.
In a separate bowl, whisk together flour, baking powder, and salt. Then gently fold the dry ingredients into the wet mixture, just until combined—be careful not to overmix.
Gently fold in the sliced apples, ensuring they are evenly coated with the batter. The mixture will be thick but moist.
Pour the batter into your prepared pan, smoothing the top with a spatula for an even surface.
Bake in the preheated oven for 40 to 45 minutes, until the top is golden and a toothpick inserted in the center comes out clean.
Remove the cake from the oven and let it cool in the pan for about 10 minutes. Then transfer it to a wire rack to cool completely, filling your kitchen with a warm, caramelized apple scent.
Allow the cake to rest for at least 15 minutes before slicing. The flavors will settle, and the crust will develop a beautiful, rustic appearance.
Slice and serve this cozy, tender apple cake with a dollop of cream or a sprinkle of powdered sugar, and enjoy the comforting aroma and delightful texture.