01 - Preheat oven to 425°F. Line a baking sheet with parchment paper.
02 - In a large bowl, whisk together flour, sugar, baking powder, and salt until well combined.
03 - Cut cold butter into the flour mixture using a pastry cutter or your fingers until the mixture resembles coarse crumbs.
04 - In a separate bowl, whisk together milk, egg, and vanilla extract until fully blended.
05 - Pour the wet ingredients into the dry mixture. Stir gently until just combined, being careful not to overmix.
06 - Drop dough by large spoonfuls onto the prepared baking sheet, forming 6 equal mounds.
07 - Bake for 15 to 18 minutes until golden brown. Remove from oven and let cool completely.
08 - Combine sliced strawberries, sugar, and lemon juice in a bowl. Let sit for at least 15 minutes, stirring occasionally, until strawberries release their juices.
09 - In a cold mixing bowl, beat heavy cream with powdered sugar and vanilla extract using an electric mixer until soft peaks form.
10 - Crumble or split the cooled shortcakes. Place pieces in the bottom of 6 clear cups. Add a layer of macerated strawberries with their juices, followed by a layer of whipped cream. Repeat layers as desired, finishing with whipped cream and a fresh strawberry slice on top. Serve immediately.