Preheat oven 350°F ( 175°C).
Boil some hot water in a pot.
Spar a 12 inch bundt cake pan with pan release.Set a kettle of water to boil for a water bath. Grease a large 12-cup Cake or Bundt pan and place it into a larger baking pan at least 1 and a half times wider and half deep.
Add the sugar to a small pot on medium low heat and cook the sugar until it becomes liquid and starts to caramelize into a light golden brown color.
Remove from heat, be careful not to splash sugar, it will be very hot.
Pour the caramilized sugar into the bundt pan immediately.
In a mixing bowl with a whisk attachment add the cream cheese and whip until smooth. You can also use a hand mixing beater or food processor or blender. Follow the same steps.
Add in the sweetened condensed milk, eggs, evaporated milk and vanilla extract and mix until well combined and mixture is smooth. Transfer flan mixture into another bowl.Set aside.
Cake preparation, Add the cake mix into the mixing bowl with the paddle attachment.
Add in the eggs, melted butter or oil and milk and mix until batter is smooth, about 4 minutes.
Transfer the cake mix into the bundt pan.
Pour in the flan mixture just under the rim of the cake pan..
Pour the boiling water into the larger baking pan and place both pan into the preheated oven and bake for 65-80 minutes.
Check to see if flan cake is baked after an hour. Insert a knife or wooden pick into the flan cake, if it should comes out dry the cake is baked.
Remove the baking pans from the oven and the flan cake pan from the water and let it cool at room temperature for 1 hour then place into refrigerator for additional 2-3 hours.
Once cooled place a plate on top of the cake pan and flip it.
Serve and enjoy.