Step 1

Preheat oven to 350 degrees. Butter a 10-inch springform pan or pie plate. Sift flour, baking powder, and salt together into a medium bowl. Set aside.

Step 2

Put butter and 1 cup sugar in the bowl of an electric mixer fitted with the paddle attachment. Mix until pale and fluffy, about 3 minutes. Add in egg, buttermilk, and vanilla extract. Mix until combined.

Step 3

Gradually mix in flour mixture. Transfer batter to prepared pan. Arrange strawberry slices on top of batter. Sprinkle turbinado sugar over berries.

Step 4

Bake cake 10 minutes. Reduce oven temperature to 325 degrees. Bake until cake is golden brown and firm to the touch, about 50-55 minutes. Let cool in pan. To serve, cut into wedges.