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.
03 - Beat butter and sugar in a large bowl until light and fluffy. Add eggs one at a time, mixing well after each addition. Blend in vanilla extract.
04 - Add flour mixture in three parts, alternating with buttermilk, beginning and ending with flour. Mix until just combined.
05 - Divide batter evenly between prepared pans. Smooth tops. Bake for 25–30 minutes, or until a toothpick inserted in the center comes out clean.
06 - Let cakes cool in pans for 10 minutes, then turn out onto wire racks to cool completely.
07 - Combine sliced strawberries and ¼ cup granulated sugar in a bowl. Let sit for 20 minutes to release juices.
08 - Whip heavy cream with powdered sugar and vanilla extract until stiff peaks form.
09 - Place one cake layer on a serving plate. Spread half the whipped cream over the cake and top with half the strawberries including their juices.
10 - Place second cake layer on top. Spread remaining whipped cream over the top and decorate with remaining strawberries. Chill for at least 30 minutes before serving.