01 - Preheat the oven to 400°F. Line a muffin tin with paper liners or lightly grease with butter.
02 - In a large bowl, whisk together the flour, sugar, baking powder, and salt until thoroughly combined.
03 - Add the cold butter cubes and cut into the flour mixture using a pastry cutter or your fingers until the mixture resembles coarse crumbs.
04 - In a small bowl, whisk together the milk, beaten egg, and vanilla extract. Pour into the flour mixture and stir just until combined—do not overmix.
05 - Divide the dough evenly among 6 muffin cups. Bake for 16 to 18 minutes until lightly golden. Allow to cool completely before assembling.
06 - While the shortcakes bake, toss the sliced strawberries with sugar and lemon juice in a bowl. Let sit for at least 15 minutes to release their natural juices.
07 - Beat the chilled heavy cream, powdered sugar, and vanilla with an electric mixer on medium-high speed until soft peaks form.
08 - Slice each cooled shortcake in half horizontally. Place the bottom half in a serving dish, layer with macerated strawberries and a dollop of whipped cream. Top with the remaining shortcake half and add more strawberries and cream. Serve immediately.