Sieve the rice powder twice to get a smooth powder.Add little salt into it.
Mix the rice powder with boiled water using a wooden spatula to get a tight dough.
In a steamer (idli maker)put some grated coconuts as first layer.Then fill the idiyappam maker with the dough and squeeze over the coconut.Again put some coconut over it .
Repeat the same process untill the dough finished.
After 10 minutes switch off the flame and transfer the idiappams in a plate and break them into small pieces.
Slice the onion,and grren chillies into small pieces. In a kadai add coconut oil and add mustard and curry leaves.When mustard brittle add the sliced onion and green chillies and fry till golden brown.
Then add salt according to taste and add pieced idiappams into it and mix well.
Cook for 2minutes.Then remove from heat .Idiappam upma is ready to serve.