01 - Preheat oven to 400°F (200°C). Line a baking sheet with parchment paper.
02 - In a bowl, combine flour, sugar, baking powder, and salt for the shortcake. Add cubed butter; cut in with fingers or pastry blender until mixture resembles coarse crumbs.
03 - Whisk together cream and egg. Add to dry mixture, stirring just until dough forms.
04 - Turn dough onto a lightly floured surface. Pat into a ¾-inch thick round. Cut into small squares or rounds (about 1-inch) for trifle portions.
05 - Place shortcake pieces on baking sheet and bake 12–15 minutes, until golden. Cool completely.
06 - Toss sliced strawberries with sugar and lemon juice in a bowl. Let stand 15 minutes until juices are released.
07 - For whipped cream, beat the cream, powdered sugar, and vanilla on high speed to stiff peaks.
08 - Layer shortcake pieces, macerated strawberries (with juice), and whipped cream in serving glasses. Repeat layers. Finish with a dollop of whipped cream and a few fresh strawberry slices.
09 - Serve immediately, or chill up to 2 hours before serving.