Firstly in a large mixing bowl take 2 ripened banana. If you are having overripened banana (black) it works great.
Add in 3 tbsp sugar depending on the sweetness of the banana.
Mash smooth with the help of a fork. But do not blend banana in mixi.
Now add ¼ cup curd, 1 tsp cumin, ½ tsp baking soda, and ½ tsp salt. Combine well with the help of a spoon.
Further, add 2½ cup maida and prepare the dough.
Knead for 5 minutes or till dough turns smooth.
Grease the dough with a tsp of oil. Cover and rest in warm place for 8 hours.
Next day, knead the dough slightly and pinch a ball-sized dough.
Dust with some maida and roll slightly thicker than poori.
Deep fry the buns in hot oil. Further fry the buns on both sides keeping flame on medium.
Fry till banana poori turns dark golden brown on both sides.
Finally, serve the Banana Buns / Mangalore Buns / Banana Poori with chutney or saagu. You can also have them plain.