1 cup plus 1 teaspoon of all purpose flour
1 teaspoon baking powder
1/2 teaspoon kosher salt
4 oz (1 stick) unsalted butter, softened
1 cup sugar
1/4 teaspoon vanilla
2 large eggs
2 cups blueberries, rinsed and drained (may substitute frozen blueberries, or substitute some of the blueberries for raspberries)
1 teaspoon lemon juice
1 Preheat oven to 350°F. Lightly grease a 9-inch springform pan and dust with flour. Or use a 9-inch round cake pan that has been greased and dusted with flour and lined on the bottom with parchment paper.
2 In a small bowl combine 1 cup of flour with the baking powder and salt and set aside.
3 Using a mixer, cream the butter, sugar and vanilla until light and fluffy, about 3 minutes. Add the eggs one at a time and beat until well blended. Reduce the speed of the mixer to low and gradually add the flour mixture. Beat until smooth. Pour the batter into the baking pan.
4 In a medium bowl, combine the berries with the remaining teaspoon of flour and the lemon juice. Spoon the berry mixture over the batter.
5 Bake for 1 hour at 350°F, or until a toothpick inserted into the center comes out clean. Remove from the oven and let the cake cool in the pan for 10 minutes. If using a springform pan, slide a thin knife around the edges of the cake to release it from the pan before you release and remove the springform. If using a cake pan, slide a thin knife around the edges of the cake and invert it onto a cake rack. Transfer the cake to a platter, berry side up. Dust the cake with confectioner’s sugar before serving.