Sieve flour with salt,soda bi-carb,baking powder in a bowl.
break egg in a bowl add sugar & milk and whisk add water.
Make a bay in the sieved flour; add egg mixture and mix. When fully mixed, knead to a soft dough; leave for 10 minutes. Then add oil and knead thoroughly. Leave covered for at least 2 hours.
Divide dough into 8 portions making balls. Place on dusted tray and leave for 30 minutes.
Flatten each with rolling pin into a round disc 8-inches in diameter. Apply butter over surface and dust with flour. Hold from ends and gather to make many folds and roll like pinwheel. Keep aside for 10 minutes.
Roll each pinwheel with rolling pin to 8 inch disc.
Place pratha in preheated oven on a tray and bake for 10 minutes at 250 centigrade or in tandoor till caramelised.