01 -
Preheat oven to 175°C. Grease a 23 × 33 cm baking pan with butter or nonstick spray.
02 -
In a medium bowl, whisk together flour, baking powder, baking soda, and salt until evenly combined.
03 -
In a large bowl, beat softened butter and granulated sugar with an electric mixer until light and fluffy.
04 -
Add eggs one at a time, beating well after each addition, then mix in vanilla extract.
05 -
Stir in sour cream, then alternately add flour mixture and milk, starting and ending with flour mixture. Mix until just incorporated; do not overmix.
06 -
Transfer batter evenly into the prepared pan and smooth the surface. Bake for 25–30 minutes or until a toothpick inserted in the centre comes out clean.
07 -
Allow cake to cool in the pan on a wire rack until completely cooled.
08 -
While cake cools, toss sliced strawberries with 3 tablespoons granulated sugar. Let stand for 20–30 minutes to release juices.
09 -
In a chilled bowl, beat heavy whipping cream, powdered sugar, and vanilla extract until soft peaks form.
10 -
Spread macerated strawberries evenly over the cooled cake, then top with generous dollops of freshly whipped cream. Slice and serve immediately.