Beat 5 room-temperature eggs with 1 cup sugar for 3-4 minutes until tripled in volume and pale yellow. The mixture should ribbon off the beaters.
5 large eggs, 1 cup granulated sugar
Sift 1 cup flour, 1½ teaspoons baking powder, and ¼ teaspoon salt into the egg mixture. Fold gently 10-15 times until just combined, stopping when streaks disappear.
1 cup all-purpose flour, 1.5 teaspoons baking powder, 0.25 teaspoon salt
Pour batter into a greased 9x13-inch pan. Bake at 350°F for 30-35 minutes until golden and a toothpick inserted comes out clean. The surface should spring back when pressed.
Pierce the warm cake 20 times with a fork or toothpick, going all the way to the bottom. Mix 14 oz sweetened condensed milk, 12 oz evaporated milk, and 1 cup heavy cream. Pour slowly over the cake, letting it absorb. Chill for 3-4 hours.
14 oz sweetened condensed milk, 12 oz evaporated milk, 1 cup heavy cream
Whip 2 cups heavy cream with 3 tablespoons sugar and 1 teaspoon vanilla extract to stiff peaks. Spread over chilled cake. Refrigerate 1 hour before serving.
2 cups heavy cream, 3 tablespoons sugar, 1 teaspoon vanilla extract