Preheat oven to 350℉
Spray 9X13 pan for baking
In a stand mixer, whip egg whites until foamy. Slowly add 200g of sugar until the egg whites form a thick meringue that are stiff peaks.
Scoop into bowl and set aside.
In the same bowl of the stand mixer (no need to wash it), add softened butter and sugar. Beat with whip attatchment on medium speed until creamy and lighter in color. Add egg yolks one at a time. At the end add vanilla.
In another bowl, whisk flour, baking powder, and salt together
Using a rubber spatula, combine the dry ingredients and milk, alternating between the two in three batches.
Gently fold the meringue into batter. Spread evenly into the 9X13 baking pan. Bake for 35-45 minutes. Check on the bake by poking a skewer through the middle and seeing if there is raw batter on it. If baked, leave in pan to cool.
Whisk the ingredients for the tres leches.
With a fork, poke many holes into the top of the cake. Pour the tres leches evenly over the cake. Cover and refigerate several hours or overnight.
To serve, prepare whip cream by adding cream, sugar and vanilla to a bowl and either by hand or by machine, whip to medium soft peaks. Spreak on top and add sliced strawberries on top. Enjoy!