01 - Preheat oven to 425°F. Line a baking sheet with parchment paper.
02 - In a large bowl, whisk together flour, sugar, baking powder, baking soda, and salt until well combined.
03 - Cut in cold butter using a pastry cutter or fingertips until the mixture resembles coarse crumbs with some pea-sized pieces remaining.
04 - Stir in buttermilk and vanilla extract just until combined; do not overmix or the shortcake will become tough.
05 - Drop 6 equal mounds onto the prepared baking sheet. Bake for 12-15 minutes until golden brown on top. Cool completely on a wire rack.
06 - Combine diced strawberries, sugar, and lemon juice in a bowl. Toss to coat and let sit for at least 10 minutes to release juices.
07 - Using a hand mixer, beat heavy cream, powdered sugar, and vanilla extract on medium-high speed until soft peaks form.
08 - Break each cooled shortcake into bite-sized chunks. Layer in serving cups: shortcake pieces, spoonful of macerated strawberries, then whipped cream. Repeat layers, finishing with whipped cream and a strawberry garnish.