To achieve a smooth and fluffy texture, combine the rice and oats and let them soak overnight.
Combine the rice, water, and soaked oats; grind until the mixture resembles a smooth batter.
Add the yogurt and salt to improve the batter's taste and consistency.
Let the batter rise naturally by letting it ferment overnight.
Before putting the idli molds in, make sure the water is hot by boiling it in a steamer.
Carefully fill each cup of oiled idli molds with fermented batter.
Serve warm with sambar or chutney after 10 to 12 minutes of steaming.