Ingredients
Equipment
Method
- Preheat your oven to 350°F (175°C). Grease and flour a 9x13 inch baking pan.
- In a medium bowl, whisk together the flour, baking powder, baking soda, and salt.
- In a large bowl, cream together the softened butter, granulated sugar, and brown sugar until light and fluffy, about 3-5 minutes.
- Beat in the eggs one at a time, then stir in the vanilla extract.
- Gradually add the dry ingredients to the wet ingredients, alternating with the sour cream, beginning and ending with the dry ingredients. Mix until just combined. Do not overmix!
- Gently fold in the diced apples.
- In a separate bowl, combine the flour, brown sugar, oats (if using), and cinnamon. Cut in the cold butter using a pastry blender or your fingertips until the mixture resembles coarse crumbs.
- Pour the cake batter into the prepared baking pan and spread evenly. Sprinkle the crumb topping evenly over the batter.
- Bake for 35-45 minutes, or until a wooden skewer inserted into the center comes out clean. If the crumb topping starts to get too brown, tent the cake with foil.
- Let the cake cool in the pan for at least 15 minutes before cutting and serving.
- While the cake is cooling, prepare the drizzle. In a small saucepan, melt the butter over medium heat. Stir in the brown sugar, milk (or cream), cinnamon, vanilla extract, and salt.
- Bring to a simmer, stirring constantly, until the sugar is dissolved and the mixture is smooth, about 2-3 minutes.
- Drizzle the cinnamon apple drizzle generously over the warm cake. Serve warm or at room temperature.
Notes
For the best results, use cold butter when making the crumb topping. Do not overmix the cake batter, as this will result in a tough cake. Firm, tart apples like Honeycrisp, Gala, or Fuji work best. Let the cake cool slightly before drizzling to prevent the drizzle from melting completely. The cake can be stored at room temperature for up to 2 days, in the refrigerator for up to 5 days, or frozen for up to 2 months. Consider adding chopped walnuts or pecans to the crumb topping for extra flavor and texture. A scoop of vanilla ice cream or a dollop of whipped cream makes a delicious accompaniment.