01 - Preheat the oven to 425°F. Line a baking sheet with parchment paper.
02 - In a large mixing bowl, whisk together the all-purpose flour, granulated sugar, baking powder, and salt.
03 - Add the cold, cubed unsalted butter to the dry ingredients. Using a pastry cutter or your fingertips, cut the butter into the mixture until it resembles coarse crumbs.
04 - In a separate small bowl, whisk together the whole milk, lightly beaten egg, and pure vanilla extract.
05 - Pour the wet ingredient mixture into the dry ingredients. Stir gently until just combined; be careful not to overmix the dough.
06 - Turn the dough onto a lightly floured surface. Gently pat it into a 1-inch thick rectangle. Using a 2.5-inch round cutter, cut out 6 shortcake rounds, re-gathering and re-patting any dough scraps as needed.
07 - Place the shortcake rounds on the prepared baking sheet. Bake for 15 to 18 minutes, or until they are golden brown. Transfer to a wire rack to cool completely.
08 - While the shortcakes bake and cool, combine the sliced fresh strawberries with granulated sugar and optional lemon juice in a bowl. Gently toss and set aside for at least 15 minutes to allow the strawberries to macerate and release their juices.
09 - In a chilled bowl, using an electric mixer, beat the cold heavy cream with powdered sugar and pure vanilla extract until soft peaks form.
10 - Once the shortcakes are cooled, carefully slice each one in half horizontally. Spoon a generous portion of the macerated strawberries and their juices over the bottom half of each shortcake. Top with a dollop of fresh whipped cream, then place the top half of the shortcake on top. Add more berries and cream if desired for garnish.