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 dry mixture using a pastry cutter or your fingers until mixture resembles coarse crumbs.
04 - In a separate bowl, whisk together milk, egg, and vanilla extract until blended.
05 - Pour wet ingredients into dry ingredients. Stir gently until just combined, being careful not to overmix.
06 - Drop dough by large spoonfuls onto prepared baking sheet, forming 6 equal mounds.
07 - Bake for 15-18 minutes or until tops are 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, powdered sugar, and vanilla extract with an electric mixer until soft peaks form.
10 - Crumble or split cooled shortcakes into pieces. Layer shortcake pieces in the bottom of 6 clear cups. Top with a scoop of macerated strawberries and some juice, then a dollop of whipped cream. Repeat layers if desired, finishing with whipped cream and a strawberry slice on top.