01 - Preheat oven to 400°F. Line a muffin tin with paper liners or lightly grease with cooking spray.
02 - In a large bowl, whisk together flour, sugar, baking powder, and salt until well combined.
03 - Add cold cubed butter to the flour mixture. Use a pastry cutter or your fingers to work butter into flour until mixture resembles coarse crumbs.
04 - In a small bowl, whisk together milk, beaten egg, and vanilla extract until smooth.
05 - Pour wet ingredients into flour mixture. Stir gently just until dough comes together; do not overmix.
06 - Divide dough evenly among 6 muffin cups. Bake for 16-18 minutes until tops are lightly golden. Let cool completely in pan.
07 - Combine sliced strawberries, sugar, and lemon juice in a bowl. Toss gently and let sit for at least 15 minutes to release juices.
08 - Beat chilled heavy cream, powdered sugar, and vanilla extract with electric mixer on medium-high speed until soft peaks form.
09 - Slice each cooled shortcake horizontally in half. Place bottom half in serving dish, top with macerated strawberries and whipped cream. Cover with top half and add more strawberries and cream. Serve immediately.