Let’s bring this cake to life! Follow these steps, and you’ll have a scrumptious cake that fills your kitchen with a delightful aroma.

1. Preheat your oven to 350°F (175°C). Grease a 9-inch round cake pan with butter or non-stick spray.
2. In a large mixing bowl, cream together the softened butter and granulated sugar until light and fluffy, about 3-4 minutes.
3. Add the eggs one at a time, beating well after each addition. Stir in the vanilla extract.
4. In a separate bowl, whisk together the flour, baking powder, salt, and ground cinnamon.
5. Gradually add the dry ingredients to the wet mixture, alternating with the milk. Begin and end with the dry ingredients. Mix until just combined.
6. Gently fold in the sliced apples, ensuring they are evenly distributed throughout the batter.
7. Pour the batter into the prepared cake pan, smoothing the top with a spatula.
8. To make the crumble topping, combine the flour, brown sugar, melted butter, and cinnamon in a small bowl. Mix until crumbly.
9. Sprinkle the crumble topping evenly over the cake batter.
10. Bake for 40-45 minutes, or until a toothpick inserted into the center comes out clean. The top should be golden brown and slightly crisp.
11. Allow the cake to cool in the pan for about 10 minutes before transferring it to a wire rack to cool completely.