01 - Combine sliced strawberries and granulated sugar in a mixing bowl. Stir thoroughly and let rest for at least 20 minutes until the berries 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 a pastry cutter or your fingertips, 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. Avoid overmixing to keep the shortcakes tender.
06 - Turn the dough out onto a lightly floured surface and gently pat it into a 1-inch thick round. Using a biscuit cutter, cut out 6 rounds and arrange them on the prepared baking sheet.
07 - Bake for 12 to 15 minutes until the tops are golden brown. Transfer to a wire rack and allow to cool completely.
08 - In a chilled bowl, beat the heavy 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. Add a dollop of whipped cream, then place the top half of the shortcake. Finish with additional berries and cream as desired.