In a mixing bowl, combine the all-purpose flour, sugar, baking powder, and salt.
Add the evaporated milk, egg, melted butter, and pandan paste.
Mix until the batter becomes smooth and no dry ingredients remain. Avoid overmixing.
Prepare your puto molds. Lightly grease them if necessary.
Fill each mold about ¾ full with the batter.
Heat the steamer over medium-high heat.
Once the water reaches a full boil, carefully place the molds inside the steamer.
Steam for 10 to 15 minutes, depending on the size of your molds.
After about 10 minutes, quickly open the steamer and place slices of cheddar cheese on top of each puto.
Continue steaming for another 2 minutes or until the cheese has melted.
Remove from the steamer and let cool slightly before removing from the molds.
Serve warm and enjoy.