Preheat the oven to 350°F (175°C) and grease a 9x13-inch baking dish.
In a bowl, whisk together the flour, baking powder, and salt.
In a separate large bowl, beat the egg yolks and 3/4 cup of sugar until pale and fluffy.
Mix in the vanilla extract and whole milk.
Gently fold in the flour mixture until just combined.
In another bowl, beat the egg whites until soft peaks form. Gradually add the remaining 1/4 cup of sugar and continue beating until stiff peaks form.
Gently fold the beaten egg whites into the batter, being careful not to deflate the mixture.
Pour the batter into the prepared baking dish and bake for 25-30 minutes, or until a toothpick inserted in the center comes out clean.
Allow the cake to cool completely, then poke holes all over the surface using a fork.
In a bowl, whisk together the sweetened condensed milk, evaporated milk, and heavy cream.
Slowly pour the milk mixture over the cake, ensuring it soaks evenly.
Refrigerate the cake for at least 2 hours or overnight to absorb the liquid.
In a mixing bowl, beat the heavy whipping cream and powdered sugar until stiff peaks form.
Spread the whipped cream over the chilled cake and sprinkle with cinnamon before serving.