I have used some jowar/sorghum flour of which I had some in the freezer. I wanted to use something healthy and thinking of whole wheat flour or oats, I finally decided to make with millet. You can try using any kind of millet flour. I have not tried but am sure it would work as long as there is chocolate in it. You can even use whole wheat flour instead of maida. The texture would be a bit more chewy in that case. And please feel free to use any kind of sugar you have. I have used orange marmalade here . I have always loved the combination of orange and chocolate.
I had made this brownies a couple of months ago for my kids snacktime. They love anything with chocolate and I promptly sneaked in some sweet potatoes making the brownies healthier. Walnuts give a nice crunch and chocolate just enhance the taste. They had a nice texture and were really delicious. Kids enjoyed and sweet potatoes imparts the necessary sweetness , So I have added very little sugar to it in the end.
This brownies are very easy and quick to make. Its basically adding a few wet ingredients to a readymade brownie mix. See the recipe to know more about it.