01 - Preheat the oven to 350°F. Grease and line two 8-inch round cake pans with parchment paper.
02 - In a large mixing bowl, beat the eggs, granulated sugar, and salt with an electric mixer on high speed for 5 to 7 minutes until thick, pale, and tripled in volume.
03 - Gently fold in the all-purpose flour and vanilla extract with a spatula, taking care not to deflate the mixture.
04 - Divide the batter evenly between the prepared cake pans. Bake for 20 to 25 minutes until golden and the surface springs back when lightly pressed.
05 - Remove cakes from the oven and cool in the pans for 10 minutes. Turn out onto a wire rack to cool completely.
06 - While cakes cool, whip heavy cream, powdered sugar, and vanilla extract together until soft peaks form.
07 - If desired, spread a thin layer of strawberry jam on one sponge. Cover with half the whipped cream and arrange half the sliced strawberries on top.
08 - Place the second sponge layer over the strawberries. Spread remaining whipped cream over the top and decorate with the remaining strawberries.
09 - Garnish with fresh mint leaves, if desired. Refrigerate for at least 30 minutes before slicing for optimal texture.