A sponge cake soaked in three milks and topped with whipped cream is Mexico's most iconic cake. This family celebration dessert is a moist, indulgent centerpiece for birthdays and fiestas.
Preheat your oven to 350°F (177°C) and grease a 9x13-inch baking pan. Make sure the oven rack is in the center position for even baking.
In a medium bowl, whisk together the flour and baking powder; set aside. Separate egg whites and yolks into large bowls.
Beat the egg yolks with 3/4 cup sugar on medium-high until pale and thick, about 2 minutes. Add whole milk, 1 teaspoon vanilla, and melted butter; mix until smooth. Gradually add the flour mixture, mixing until just combined—do not overmix.
Beat egg whites with remaining 1/4 cup sugar to stiff peaks, then gently fold into the batter in three additions. Spread the batter evenly in the prepared pan and bake for 22–25 minutes, or until golden and a toothpick comes out clean.
Let the cake cool in the pan for 15 minutes. Poke the surface all over with a fork. In a mixing jug, whisk together condensed milk, evaporated milk, and 1/2 cup heavy cream. Slowly pour the milk mixture evenly over the cake, allowing it to soak in. Refrigerate for at least 2 hours or overnight.
Before serving, beat remaining 1 cup heavy cream with powdered sugar and 1 teaspoon vanilla to medium peaks. Spread whipped cream topping over chilled cake. Slice and serve cold.