n a medium bowl whisk together flour, baking powder, baking soda, and salt; set aside.
In the bowl of a food processor fitted with a paddle attachment, cream together butter and sugar.
Add eggs and vanilla extract and beat to combine.Beat in ½ dry ingredients, followed by the sour cream, and then the remaining dry ingredients.
Use a rubber spatula to gently fold in berries.Pour cake batter into prepared pan and smooth top.
Break crumb into ½-inch pieces and sprinkle evenly over top of cake.
Bake until crumbs are golden and a cake tester inserted into the middle of the cake comes out clean, about 50 minutes. Let cool 10 minutes before releasing from pan.