Pour rum, water and oil into a medium bowl. Add one package of Vanilla Mix.
Mix it up using a wire whisk. Pour into a greased microwaveable pan (NOTE: an 8” or 9” round or square pan will do)
Place the pan in the center of the microwave. Bake on high for 5-7 minutes (NOTE: Times are based on 1200-watt microwaves)
Let cool.
While cake is cooling, combine the whole milk, sweetened condensed milk and evaporated milk.
Use a fork to poke holes all over the top of the COOLED 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 for at least 2 hours or overnight, to allow it to soak up the milk.
Spread whipped cream over the top of the cake.
Portion into 8 pieces. Serve!