Sift the rice flour, salt, baking powder and white sugar together.
In a large bowl, add the coconut milk to the sifted ingredients and blend until the mixture is smooth.
Slice the cheddar cheese into thin rectangles.
Carefully pour the mixture into the muffin pans (greased with butter beforehand), making sure you leave 1/3 space at the top. This is to give the puto space to expand upon cooking, then place the sliced cheese on top of each puto mixture.
Steam for about 20 to 30 minutes.
To check if the Puto is already cooked, insert a toothpick into the centerof each puto, make that the toothpick must come out clean.