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 well 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.
05 - Pour the wet ingredients into the flour mixture. Stir gently with a spatula just until combined; be careful not to overmix.
06 - Divide the dough evenly among 6 muffin cups. Bake for 16–18 minutes until the tops are lightly golden. Let cool completely in the pan before removing.
07 - 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 juices.
08 - Beat the chilled heavy cream, powdered sugar, and vanilla with an electric mixer on medium-high speed until soft peaks form, about 3–4 minutes.
09 - Slice each cooled shortcake in half horizontally. Place the bottom half on a serving plate, layer with macerated strawberries and a generous dollop of whipped cream. Top with the other half and add more strawberries and cream. Serve immediately.