In a large bowl, melt the butter or margarine. Ensure there's enough room in the bowl for the mixing the other ingredients later.
Add eggs and sugar to the melted margarine, mixing them thoroughly.
Incorporate flour, milk, salt, and baking powder into the mixture. If desired, add vanilla extract for flavor. Ensure the dough has a liquid consistency suitable for pouring onto the waffle iron. Mix well using a mixer.
Preheat the waffle iron and bake each waffle until golden brown. Before baking the first waffle, it's recommended to lightly brush the heating surfaces with sunflower oil.
Immediately after baking, while the waffles are still hot, carefully roll them into tubes. Delaying this step may cause the waffles to harden and crumble.
Allow the waffles to cool, then fill them with boiled condensed milk using a spoon. Optionally, mix the condensed milk with chopped peanuts or any other desired fillings, such as Nutella or fruit salad.
Your delightful delicacy is now ready to enjoy! Bon appétit!