Blend lentils, oats, chili, and salt in a blender or food processor, adding water as necessary, until you achieve a smooth batter, similar in consistency to pancake batter.

Let the batter rest for an hour in a warm place.

Give it a good mix.

Heat a cast iron pan over medium to high heat

Lower the heat and pour a spoonful of dosa batter into the middle of the pan. Utilizing a flat-bottomed ladle, begin from the pan's center and evenly distribute the batter in a circular pattern.

Increase the heat to a medium-high setting and let the dosa cook.

Drizzle with oil, and spread it using a spatula.

Allow it to cook for about 2-3 minutes, or until the center and edges of the dosa begin to brown.

Circle the spatula around the dosa's edge, then gently fold it in half, and roll it up.

Proceed with the rest of the batter and serve with chutney or dal for enjoyment.