Step 1: Prepare the Apples
Start by peeling, coring, and slicing your apples into thin wedges or chunks. Uniform pieces ensure that the apples bake evenly within the cake. Toss the sliced apples with a little cinnamon and sugar to enhance their flavor. Set them aside while you prepare the rest of the cake.
Step 2: Make the Crisp Topping
In a separate bowl, combine the melted butter, brown sugar, flour, cinnamon, and a pinch of salt. Stir until the mixture becomes a crumbly texture. This will form the crispy topping that will provide a delightful crunch to the cake.
Step 3: Prepare the Cake Batter
In a large mixing bowl, cream the softened butter and granulated sugar until light and fluffy. Add the eggs one at a time, beating well after each addition. Stir in the vanilla extract and sour cream.
In a separate bowl, whisk together the dry ingredients—flour, baking powder, baking soda, and salt. Gradually fold the dry ingredients into the wet ingredients, mixing until just combined. Be careful not to overmix, as this can affect the texture of the cake.
Step 4: Assemble the Cake
Grease your 9-inch baking pan, then spread half of the cake batter evenly at the bottom. Layer the cinnamon-sugared apples on top, then gently spread the remaining batter over the apples. Finally, sprinkle the prepared crisp topping over the entire surface of the cake.
Step 5: Bake the Cake
Preheat your oven to 350°F (175°C). Place the cake in the oven and bake for 40-50 minutes. The cake is done when a toothpick inserted into the center comes out clean and the top is golden brown. If the topping is getting too dark before the cake is fully cooked, you can tent it with foil to prevent burning.