This cake is best served warm but is also delicious later the same day.



Ingredient Checklist


Instructions Checklist
  • Preheat oven to 350 degrees. Butter and flour an 8-inch square metal baking pan, tapping out excess flour. Combine 1 cup oats and water and let stand until oats have softened, about 5 minutes. Meanwhile, whisk together flour, baking soda, baking powder, salt, and cinnamon in a separate bowl.

  • Beat together butter, granulated sugar, and brown sugar in a medium bowl with a mixer on medium-high speed until light and fluffy, about 3 minutes. Reduce speed to medium and beat in egg and vanilla until just combined, scraping down sides of bowl if necessary. Add flour and oat mixtures and beat on low speed until just incorporated. Fold in about half of berries.

  • Spread batter in pan and sprinkle with remaining 3 tablespoons oats and sanding sugar. Scatter remaining berries evenly over top. Bake until a toothpick inserted in center comes out with moist crumbs attached, 40 to 45 minutes. Let cool on a wire rack 30 minutes; cut into squares.

Reviews (7)

102 Ratings
  • 5 star values: 13
  • 4 star values: 20
  • 3 star values: 42
  • 2 star values: 22
  • 1 star values: 5
Rating: 5 stars
Gluten-free variation: omit all-purpose flour and substitute 1/2 cup sweet white rice flour, 2 tablespoons gluten-free oat flour and 2 tablespoons tapioca flour. I dusted the pan with millet flour. This cake was really good. The texture was like normal cake, not dry like some gluten-free cakes.
Rating: 5 stars
i have made this dozens of times with blue berries and black berries, raspberries or all blue berries. it is great, i make them now and freeze them for a quick breakfast. the best blue berry cake i have ever eaten. the oats make this cake, even works as a healthy snack.
Rating: Unrated
Made it, the cake had a bread pudding texture to it that I did not enjoy, though it would be more crisp
Rating: 3 stars
Made it yesterday, doubled the portion of cinnamon and everybody loves it, but the baking time totally should be longer around 1 hour. I used frozen blueberry and still great!
Rating: 5 stars
Made this last night. Very easy turned out great. Followed the directions exactly with one exception I used frozen blackberries from last season. I let them get to room temp in a strainer before making the cake. Took close to 50 mins to bake correctly. Overall great! Will make again!
Rating: Unrated
Delicious! This cake was a breeze to put together and forgiving too: my brown sugar was a bit warm (I had microwaved it to remove clumps) and melted the butter slightly, and I probably beat it a bit longer than necessary after I added the egg. But it was a hit nonetheless... everybody wanted seconds!
Rating: 2 stars
This is the first review I have ever written. I felt compelled to write it because this recipe is a mess! OK, it's not horrible but DEFINITELY don't follow these directions because I made it exactly according to the recipe and it was SO salty! Whoever said to use coarse salt for this recipe was crazy! I will make it again, but only with a TINY pinch of table salt. It would have been a lovely cake that would have been great for breakfast or with an afternoon coffee but not with all that salt!