01 - In a mixing bowl, combine the sliced strawberries with 1/3 cup granulated sugar. Stir thoroughly and set aside for at least 20 minutes to allow the berries to release their natural juices.
02 - Preheat oven to 425°F. Line a baking sheet with parchment paper and set aside.
03 - In a large bowl, whisk together the flour, sugar, baking powder, baking soda, and salt until evenly distributed.
04 - Add the cold cubed butter to the flour mixture. Using your fingers or a pastry cutter, work the butter in until the mixture resembles coarse crumbs with some pea-sized pieces remaining.
05 - Pour in the cold buttermilk and vanilla extract, stirring gently just until the dough comes together. Be careful not to overmix.
06 - Turn the dough onto a lightly floured surface and gently pat it into a 1-inch thick round. Using a biscuit cutter, cut out 6 rounds and place them on the prepared baking sheet.
07 - Bake for 12 to 15 minutes, or until the tops are golden brown. Transfer to a wire rack and allow to cool completely.
08 - In a chilled bowl, beat the heavy whipping cream, powdered sugar, and vanilla extract with an electric mixer or whisk until soft peaks form.
09 - Split each cooled shortcake in half horizontally. Spoon the macerated strawberries and their juices generously over the bottom half. Dollop whipped cream on top, then place the remaining shortcake half. Finish with additional berries and cream as desired. Serve immediately.