Ingredients
Equipment
Method
Make the cake batter
- Heat the oven to 350°F.
- Grease a 9x13-inch baking dish.
- Whisk the flour, baking powder, baking soda, and salt together in a medium bowl.
- In a large bowl, beat the butter and granulated sugar with a mixer until light and fluffy, 2 to 3 minutes.
- Beat in the eggs one at a time.
- Beat in the vanilla.
- Mix in the sour cream until combined.
- Add the flour mixture in three additions, mixing on low just until no dry streaks remain.
Prepare the apple swirl
- In a medium bowl, toss the apples with the brown sugar and cinnamon until evenly coated.
Assemble and bake
- Spread half the batter in the prepared dish.
- Distribute half the apple mixture over the batter.
- Spread the remaining batter on top.
- Finish with the remaining apple mixture.
- Use a knife to make a few shallow swirls through the top layer.
- Bake for 50 to 60 minutes, until the top is golden and a toothpick inserted into a cake portion, away from apple pieces, comes out with a few moist crumbs.
- Cool in the dish for 20 minutes.
Glaze the cake
- Whisk the powdered sugar and milk until smooth.
- Drizzle the glaze over the warm cake.
Notes
For even baking, cut the apples into uniform 1/2-inch pieces. Refrigerate covered for up to 4 days; freeze well-wrapped slices for up to 3 months. Plain Greek yogurt can replace the sour cream.
