Preheat oven to 350°F (175°C). Grease and flour a 9x13 inch baking dish.
In a medium bowl, combine flour and baking powder. In a large bowl, beat butter and sugar until fluffy. Add eggs one at a time, and the vanilla extract.
Alternate adding flour mixture and whole milk, beginning and ending with the flour mixture. Pour batter into prepared dish and bake for 30 minutes.
While the cake is baking, mix together whole milk, sweetened condensed milk, and evaporated milk in a large bowl.
When the cake is done, remove from oven and let it cool slightly. Poke holes all over the cake with a fork, then slowly pour the milk mixture over the cake.
Refrigerate cake for at least one hour, or until most of the milk is absorbed.
Whip heavy cream with powdered sugar and vanilla extract until it forms peaks. Spread over the top of the cake and garnish with sliced strawberries.
Notes
Make sure to poke enough holes in the cake for the milk mixture to be fully absorbed. For extra flavor, you can add a tablespoon of rum to the milk mixture if desired.