Masala Uttapam is a popular South Indian dish that is made by adding a spicy potato filling to the Uttapam batter. The potato filling is made by sautéing boiled and mashed potatoes with onions, green chilies, and spices. Spread the potato filling evenly on top of the Uttapam batter while cooking and press it gently. The result is a flavorful and satisfying Uttapam that can be enjoyed with coconut chutney or tomato chutney.