In a large mixing bowl, combine 2 cups of whole wheat flour (atta), 1 teaspoon of salt, and 1 tablespoon of oil. Gradually add water and knead the mixture into a soft dough. Cover the dough and let it rest for 20 minutes.
In a separate bowl, mix 1/4 cup of finely chopped green chillies, 1/4 cup of finely chopped coriander leaves, 1/2 teaspoon of red chilli powder, 1/2 teaspoon of garam masala, and 1/2 teaspoon of chaat masala.
Divide the dough into 6 equal portions and roll each portion into a ball.
Flatten a dough ball and roll it out into a small circle using a rolling pin. Place a spoonful of the chilli mixture in the center of the circle and fold the edges over the filling, sealing it completely.
Gently roll out the stuffed dough ball into a paratha, ensuring that the filling does not spill out.
Heat a tawa or non-stick pan over medium heat. Place the rolled paratha on the tawa and cook until golden brown spots appear on one side. Flip the paratha and cook the other side similarly, applying a little oil or ghee on both sides.
Repeat steps 4-6 for the remaining dough balls.
Serve the Chilli Paratha hot with yogurt, pickle, or any curry of your choice.