Powder the Oats (1 cup) using a mixer. Dry roast the oats powder in high flame for five minutes. Stir continuously, else the powder might burn.
Allow the powder to cool and then add little Salt (to taste) to the oats powder and mix well. To this sprinkle Water (1/2 cup) little by little and stir well with your hands. The whole mixture should be wet. You can see lumps formed. But that's perfectly fine as by the next step it will be smooth.
Put the wet oats powder to a blender and just give it a quick blend so that it becomes smooth oats puttu podi.
To the puttu maker first add little Coconut (1/2 cup), then put two handfull of oats powder and then again coconut. Repeat the same till top of the puttu maker and attach the puttu maker to the puttu vessel and steam. Once steam starts to come from the top of the puttu maker keep on flame forfive 5 more minutes and then switch off the flame. Serve hot with chickpea or Green gram curry.