In a large mixing bowl, combine the flour and salt. Gradually add enough water to make a smooth and pliable dough. Knead for 5-10 minutes, then cover and set aside for 20-30 minutes.
In a separate bowl, mix together the mashed sweet potato, salt, red chili powder, cumin powder, garam masala, amchur, and chopped coriander.
Divide the dough into equal-sized balls and roll out each ball into a circle.
Place a spoonful of the sweet potato mixture in the center of each circle.
Gather the edges of the circle together and pinch them closed to encase the filling.
Roll out each stuffed ball into a flat disc, about 6-7 inches in diameter.
Heat a griddle or non-stick pan over medium-high heat. Once hot, place a paratha on the griddle and cook for 1-2 minutes on each side, until golden brown.
Repeat with the remaining parathas.
Serve hot with your favorite chutney or yogurt.