01 - Preheat oven to 400°F. Line a baking sheet with parchment paper.
02 - In a mixing bowl, whisk together flour, granulated sugar, baking powder, and salt. Add cubed cold butter and cut in using your fingers or a pastry blender until the mixture resembles coarse crumbs.
03 - In a small bowl, whisk together the heavy cream and egg. Pour into the dry mixture and stir gently just until the dough comes together. Do not overmix.
04 - Turn dough onto a lightly floured surface and pat into a ¾-inch thick round. Cut into small 1-inch squares or rounds suitable for individual trifle portions.
05 - Arrange shortcake pieces on the prepared baking sheet. Bake for 12–15 minutes until golden brown. Transfer to a wire rack and cool completely.
06 - Place sliced strawberries in a bowl and toss with granulated sugar and lemon juice. Let stand for 15 minutes until the berries release their natural juices.
07 - In a chilled bowl, beat the heavy cream, powdered sugar, and vanilla extract on high speed until stiff peaks form.
08 - Layer shortcake pieces, macerated strawberries with their juices, and whipped cream in individual serving glasses. Repeat the layers once more, finishing with a dollop of whipped cream and a few fresh strawberry slices on top.
09 - Serve immediately, or refrigerate for up to 2 hours before serving.