look, i cannot help you with how to make a khasta roti. but i can definitely help you with how to EAT one.
you know, khasta roti is the best roti to eat. i mean, crispy

you know the crispy parts should be eaten plain. and the soft dough only should b eaten with chicken or whatever you are eating with it. you can make sure that you have a khasta roti in front of you before you start to eat. that would be definitely a wise thing to do i assure you that

(i have so much knowledge cz i always follow the same procedure before eating my roti)
hope the above helps.