This peach coffee cake is a summer baking favorite, featuring a soft sour cream cake layered with sweet peaches and topped with a buttery oat crumble. It’s simple, delicious, and perfect for sharing.
Combine the peaches, sugar, lemon juice and cornstarch in a medium bowl. Set aside.
To make the topping:
Combine the flour, brown sugar, oats, and cinnamon.
Add the butter, and mix with a pastry blender, a fork, or your fingers until combined. Set aside.
To make the cake:
Preheat oven to 350°F (175°C). Grease a 9"x 13"x 2" baking pan.
Whisk together the flour, baking powder, baking soda, and salt. Set aside.
Using an electric mixer on medium speed, beat the butter and sugar until light and fluffy. Add the eggs, one at a time, mixing well after each addition. Mix in the sour cream and vanilla.
Reduce mixer speed to low. Gradually add the flour mixture, mixing just until combined.
Transfer about half of the batter to the prepared pan, spreading evenly.
Spoon the peach mixture over the batter, leaving any excess liquid in the bowl.
Drop the remaining batter over the peaches. Sprinkle the reserved topping over the top.
Bake 60 to 70 minutes, or until a pick inserted into the center comes out clean.