01 - Preheat oven to 400°F. Line baking sheet with parchment paper.
02 - Whisk flour, sugar, baking powder, and salt in large bowl until thoroughly combined.
03 - Cut cold butter into flour mixture using pastry cutter or fingertips until mixture resembles coarse crumbs.
04 - Whisk milk, egg, and vanilla in small bowl. Pour into flour mixture and stir gently until just combined.
05 - Drop 6 equal dough portions onto prepared baking sheet. Flatten each mound slightly with fingers.
06 - Bake 15-18 minutes until golden brown. Cool completely on wire rack.
07 - Toss sliced strawberries with sugar and lemon juice. Let stand 15 minutes to release juices.
08 - Beat chilled cream with powdered sugar and vanilla in chilled bowl until soft peaks form.
09 - Split shortcakes horizontally. Place bottom half in cup, top with strawberries and juices, add whipped cream, then top with remaining shortcake half. Garnish with additional berries and cream.
10 - Serve immediately while components are fresh.