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