Preheat oven to 350°F. Prep a 9x13-inch baking dish with baking spray. Separate the egg yolks from the egg whites and set aside.
5 large eggs
In a large bowl of a stand mixer, beat ¾ cup of the sugar with the egg yolks on medium-high until creamy and light. Add the milk and vanilla and beat again, scraping down the sides of the bowl as needed.
1 cup granulated sugar, ½ cup whole milk, 1 teaspoon vanilla extract
Add the flour, cocoa powder, baking powder, baking soda, and salt, mixing just until combined.
1 cup all-purpose flour, ½ cup natural unsweetened cocoa powder, 1 teaspoon baking powder, ½ teaspoon baking soda, ¼ teaspoon table salt
Whisk the eggs whites, gradually adding the remaining ¼ cup of sugar until stiff peaks form. Fold into the cake batter.
Pour into the prepared pan.
Bake for 25-30 minutes. Cool completely, then poke all over with a fork.
In a separate bowl, whisk together the cocoa powder, sweetened condensed milk, evaporated milk, and milk. Pour over the cooled cake. Let soak for at least 3 hours or overnight in the fridge.
1 (14-ounce) can sweetened condensed milk, 1 (12-ounce) can evaporated milk, 2 Tablespoons natural unsweetened cocoa powder, ½ cup whole milk
Whip the cream, cocoa powder, sugar, and vanilla, then spread over the cake. Sprinkle with semi-sweet chocolate curls, slice, and serve.
2 cups heavy whipping cream, ½ cup granulated sugar, 3 Tablespoons natural unsweetened cocoa powder, 2 teaspoons vanilla extract, 4 ounces shaved semisweet chocolate