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 pea-sized butter pieces remaining.
04 - Pour buttermilk and vanilla extract into the flour mixture. Stir gently with a spatula just until the dough comes together; do not overmix.
05 - Drop 6 equal mounds of dough onto the prepared baking sheet. Bake for 12 to 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 well and let stand for at least 10 minutes, stirring occasionally, until strawberries release their juices and become syrupy.
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.
08 - Break each cooled shortcake into bite-sized chunks. Layer in serving cups or jars: place shortcake pieces at the bottom, add a generous spoonful of macerated strawberries, then top with whipped cream. Repeat layers once more, finishing with whipped cream and a fresh strawberry piece for garnish.