In a large bowl, whisk together the all-purpose flour, whole wheat flour, and salt. Mix well, making sure everything is well combined.
Add ¾ cup milk and mix well. Start kneading, adding milk as required.
Add the oil and continue to knead for 5-10 minutes. Knead to a smooth and non-sticky dough.
Grease the dough and transfer it to a clean greased bowl, then rest for 4 hours.
After 4 hours, knead the dough again, then pinch a small ball-sized dough.
Dust with more flour, and roll gently. Roll as thin as possible, dusting extra flour to prevent it from sticking.
Heat a large skillet or non-stick pan over high heat.
Take the rolled roti and stretch gently, making sure it turns translucent (the hand should be clearly visible).
Place over the hot pan. make sure to keep the high heat on from the bottom.
Cook until the bubbles start to appear, then flip over and press, cooking on all sides.
Fold the roti and serve immediately.
Enjoy with family and friends!