Preheat your oven to 350 degrees F.

Prepare a 9 inch round cake pan with baking spray and a round piece of parchment paper.

In a large mixer, cream together the butter and sugar for 2-3 minutes until light and fluffy.

Add the eggs, one at a time, until fully combined. Add the buttermilk and lemon extract and mix on low until just incorporated.

In another small bowl, sift together the cake flour, baking powder and salt. Add the dry ingredients to the wet ingredients and mix until you have a smooth batter.

Using a spatula, gently fold in the blackberries.

Pour the cake batter into the prepared baking pan and baking for 30 minutes.

Remove the cake from the oven and let cool for at least 10 minutes before dusting with powdered sugar. Serve warm or at room temperature.