In a medium bowl, whisk together flour, baking powder, baking soda, and salt. Set aside.
In a large bowl, cream together sugar and butter with an electric mixer. Add in eggs one at a time, then add vanilla extract and beat until well combined.
Alternate adding dry ingredients and buttermilk to the bowl, mixing on low speed until just combined.
Gently fold in blueberries.
Spread batter in a greased 9-inch round cake pan.
In a medium bowl, mix together brown sugar, flour, butter, and cinnamon until crumbly. Sprinkle this mixture evenly over batter in the cake pan.
Bake for 25-30 minutes, or until golden brown and a toothpick inserted into the center comes out clean.
Allow to cool before serving.
Interesting Facts
This cake is a type of “buckle,” which is a type of American cake with a streusel topping.
This Maritime Blueberry Buckle is inspired by the cuisine of the Canadian Maritime provinces, including Newfoundland and Labrador, New Brunswick, and Nova Scotia.
Blueberries are a very healthy fruit, rich in antioxidants and other essential nutrients.