In large mixing bowl take Gram flour / besan, Rice flour, salt, chili powder and hing mix well
To this add the dosa batter
Add water slowly and mix it to thick lump free batter
Peel the raw banana with peeler or knife and cut them to medium slices and meanwhile heat the oil for the deep frying
Now dip the each banana slices in the batter well ( banana should be coated well )
Drop it in to hot oil, fry these bajjis in medium flame, flip it to other side fry till it turns golden brown
Fry these bajjis in medium flame, flip it to other side fry till it turns golden brown
Serve it hot with chutney or tea