Preheat oven to 350°F.
Line a 9” round pan or skillet with parchment paper.
In a small bowl combine the flour, baking powder and salt; set aside.
In the bowl of a stand mixer cream the sugar and butter.
Add egg and lemon zest and beat until fluffy.
Add the dry ingredients to the wet, alternating with the buttermilk. Don’t over-mix.
Gently fold in the berries, reserving some for the top.
Spread the mixture in the pan and sprinkle the remaining berries over the top.