Adapted from Ina Garten's Make It Ahead: A Barefoot Contessa Cookbook
Preheat the oven to 350°F. Butter a 9-by-13-by-2-inch baking pan.
Sift the flour, baking powder and salt into a small bowl and set aside. Place the eggs, 1 cup of granulated sugar and the vanilla extract in the bowl of an electric mixer fitted with the paddle attachment and beat on medium-high speed for 10 minutes until light yellow and fluffy. Reduce the speed to low and slowly add half the flour mixture, then the milk and finally the remaining flour mixture. Mix with a rubber spatula to be sure the batter is well mixed.
Pour the batter into the prepared pan, smooth the top and bake for 20 to 25 minutes, until the cake springs back when touched lightly in the middle and a cake tester comes out clean. Set on a wire rack to cool in the pan for 40 minutes.
Dust the cake with confectioners' sugar, cut in 12 squares and place on dessert plates. Surround each serving with the strawberries, put a dollop of whipped cream on top and serve.
Toss the strawberries with the 5 tablespoons of granulated sugar.
Place mixer bowl in freezer for at least 20 minutes to chill. Pour whipping cream, sugar and vanilla into the cold bowl and beat on high speed until medium to stiff peaks form, about 1 minute.