Hello FrugalBaker. That is a great find, and it is very common to wonder how atta differs from the standard wheat flours found in Western supermarkets.
To understand the difference, it helps to look at the wheat variety and the milling process. Standard Western whole wheat flour is typically roller-milled from hard red or white wheat, where the bran, germ, and endosperm are separated, processed, and then recombined. This often leaves the bran in visible, relatively coarse flakes. Atta flour, on the other hand, is traditionally chakki-milled, which is a stone-grinding process that pulverizes the entire grain into a very fine, powdery texture, even though it retains the bran and germ. Furthermore, atta is usually milled from semi-hard durum wheat or specific high-protein Indian wheat varieties.
Because of the fine grind and the damaged starches created during stone milling, atta absorbs significantly more water than regular all-purpose or standard whole wheat flour. Dough made from atta tends to be very pliable, smooth, and extensible, but it develops less gluten elasticity.
In terms of baking results:
For flatbreads, atta is outstanding. If you make chapatis, rotis, parathas, or even homemade flour tortillas and pita breads, atta produces a very soft, tender, and easily rollable dough that holds up well without tearing.
For leavened loaf breads and pastries, it is generally not an ideal direct one-to-one substitute for all-purpose or bread flour. Because the gluten network does not develop the same high-rising elasticity, a standard yeast loaf made with 100 percent atta will turn out quite dense and crumbly. Additionally, if you do not increase the water in your recipe, the dough will be much too dry.
If you want to use it up in everyday baking, you can comfortably substitute about 25 to 50 percent of the flour in your standard bread or muffin recipes with atta, provided you add a splash of extra water to account for its higher absorption. For all unleavened flatbreads, feel free to use it as a full replacement.
