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Mix rice flour, urad dal flour (optional), salt, and water to form a smooth batter. Let it rest for 10 minutes.
Heat a non-stick or cast-iron griddle over medium-high heat until hot.
Pour a ladleful of batter onto the center of the hot griddle. Use the back of the ladle to spread the batter in a circular motion to form a thin layer.
Drizzle a little oil around the edges of the dosa and on the top surface.
Let the dosa cook for 1-2 minutes until the edges start to lift and turn golden brown.
Once the edges are crisp, gently flip the dosa using a spatula. Cook for another minute until the other side is golden brown. Serve hot with chutney or sambar.