01 - Preheat oven to 350°F. Grease and line two 8-inch round cake pans with parchment paper.
02 - Whisk together flour, baking powder, baking soda, and salt in a medium bowl until well combined.
03 - In a large bowl, beat softened butter and granulated sugar until light and fluffy, about 3-4 minutes.
04 - Beat in eggs one at a time, mixing well after each addition. Stir in vanilla extract.
05 - Alternately add flour mixture and buttermilk to the butter mixture, beginning and ending with flour. Mix until just combined.
06 - Divide batter evenly between prepared pans. Bake for 22-25 minutes or until a toothpick inserted into the center comes out clean.
07 - Let cakes cool in pans for 10 minutes, then invert onto wire racks to cool completely.
08 - Toss sliced strawberries with sugar and lemon juice. Let macerate for at least 20 minutes, stirring occasionally to release juices.
09 - In a chilled bowl, whip heavy cream, powdered sugar, and vanilla extract until stiff peaks form.
10 - Place one cake layer on a serving plate. Top with half the strawberries and juice, then spread half the whipped cream. Add second cake layer, remaining strawberries, and remaining whipped cream.
11 - Refrigerate assembled cake for 1 hour before slicing to allow flavors to meld and layers to set.