A simple, tasty puto that is soft, moist and delightfully sweet.
Prepare a steamer pan that is about 12 inches in diameter by letting water simmer in the bottom layer.
Line the steamer pan with a large sheet of aluminum foil. The foil should cover the entire bottom of the pan then up the entire sides, with about an inch or two over hang.
Pour the puto batter onto the foil-lined steamer pan and position it on top of the pan with the simmering water. Cover the puto , first with a clean kitchen towel that is pulled taut to prevent it from dipping into the batter, then with the lid.
Steam for 40-45 minutes. Once the sides are set and the middle is a little wobbly, arrange the strips of cheese on the top surface of the puto and steam for another 10-15 minutes, or until puto has completely set. Remove cover, and let puto cool before moving to a serving plate.