In a bundt pan pour the caramel sauce evenly.
In the blender add the flan mix packet - if using store bought one- with half of the milk indicated on the packet itself and blend very well. Or else make your own favorite flan recipe.
Now we’ll start making the cake, in your blender add the eggs, vanilla powder, milk, sugar and oil and mix well.
Sift the flour with the baking powder- and add cocoa powder if using- in a bowl, add the liquid mixture gradually and mix.
Pour the cake batter slowly and evenly over the flan.
Place the cake pan in a large roasting pan and fill the roasting pan halfway with hot water..
Place in a 350F pre heated oven and bake for 60-75 minutes.
Take the bundt pan out and let it cool completely then refrigerate overnight or at least for 4 hours - the more the better.
To release the cake, place the pan in a large bowl of hot water, turn it out onto a serving platter.
Cut and.. Enjoy!!