In a medium bowl, whisk together the flour, granulated sugar, baking powder, and salt. With a pastry blender, two knives used scissor style, or your hands, blend in ½ cup butter until crumbly. With a fork, stir in the egg and mix just enough to blend. Add heavy cream and mix just enough to incorporate (do not overmix).

Preheat the oven to 350 degrees f. Lightly grease a 9-in cake pan, line the bottom with wax paper and grease the paper.

Press the dough evenly into the bottom of the cake pan. Place the blueberries on top of the dough and sprinkle with the brown sugar. Place the remaining two tblspoons butter pieces over the berries.

Bake for 20-25 minutes, or until golden brown. Cool on a wire rack. Remove the cake from the pan, cut in wedges, and serve with blackberries, raspberries, and strawberries.