Strawberry Cake

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6 tablespoons unsalted butter, at room temperature
1 1/2 cups all-purpose flour
1 1/2 teaspoons baking powder
1/2 teaspoon salt
1 cup granulated sugar 
 1 large egg
1/2 cup buttermilk
1 teaspoon pure vanilla extract
1 pound strawberries, hulled and sliced

Preheat oven to 350 degrees. Butter a pie plate. Sift flour, baking powder, and salt together into a medium bowl. Set aside.
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.
 Gradually mix in flour mixture. Transfer batter to prepared pan. Arrange strawberry slices on top of batter. Sprinkle turbinado sugar over berries. 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.