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 thoroughly blended.
03 - Work cold butter into the flour mixture using a pastry cutter or fingertips until the texture resembles coarse crumbs. Keep the mixture cold to maintain flaky texture.
04 - Pour buttermilk and vanilla into the flour-butter mixture. Stir gently just until the dough comes together. Avoid overmixing to prevent tough shortcakes.
05 - Drop 6 equal mounds of dough onto the prepared baking sheet. Bake for 12–15 minutes until golden brown on top. Transfer to a wire rack and cool completely.
06 - Combine diced strawberries, sugar, and lemon juice in a bowl. Toss to coat evenly and let stand at room temperature for at least 10 minutes, allowing the berries to release their juices.
07 - Using a hand mixer or stand mixer fitted with the whisk attachment, beat heavy cream, powdered sugar, and vanilla on medium-high speed until soft peaks form. Do not overwhip.
08 - Break cooled shortcakes into bite-sized chunks. Layer in individual serving cups or jars: start with shortcake pieces, followed by a generous spoonful of macerated strawberries and their juices, then whipped cream. Repeat layers as desired, finishing with whipped cream and a fresh strawberry garnish. Serve immediately.