Start by cutting the guava paste into 12 equal-sized cubes.
Now, in the aluminum foil molds, pour the condensed milk, spreading evenly between each mold – make sure not to fill them all the way to the top.
Into the center of each mold, put 1 cube of the guava paste.
Transfer all the molds to a baking tray, take to a preheated oven at 180°C (356°F) and bake for 40 minutes.
Transfer the rest of the guava paste cubes to a bowl and melt them in a microwave for 40 seconds.
Once the desserts have baked through in the oven, top them with the melted guava paste and spread well.
Finish with grated coconut to taste.
Serve.