Preheat oven to 350°F. Grease only the bottom of a 9x13'' pan and line with parchment paper. Combine flour, baking powder, and salt in a bowl.
Separate the eggs.
In a large bowl, add 3/4 cup sugar & the egg yolks and mix on high speed until yolks are light and creamy.
Add the 1/3 cup milk and vanilla and stir to combine. Add the flour mixture into the yolk mixture and stir gently just until combined (don't over-mix).
Use electric beaters to beat the egg whites on high speed. Gradually add the remaining 1/4 cup of sugar as you mix and continue beating until stiff peaks.
Fold egg whites into the batter gently, just until combined.
Pour batter into prepared pan and level the batter.
Bake for 25 to 35 minutes, or until a toothpick inserted in the center of the cake comes out clean. Remove from the oven and allow the cake to cool completely.
Remove the parchment paper and place the sponge downside up into the pan.
Combine the evaporated milk, sweetened condensed milk, and whole milk in a small bowl.
Once the cake has cooled, poke holes all over the top of the cake. Slowly pour the milk mixture over the top of the cake, making sure to pour near the edges and all around.
Refrigerate the cake covered for at least 2 hours or overnight.
In the meantime, whip the heavy cream, sugar and vanilla until stiff peaks.
Smooth over the top of the cake.
Refrigerate for 1 hr to get clean cuts(optional). Sprinkle cinnamon on top. Serve with fresh sliced strawberries, if desired. Enjoy!