Adapted from bonappetit.com
cup whole wheat flour
cup all-purpose flour, plus more for dusting
cup plain yogurt
Whisk whole wheat flour and 1 cup all-purpose flour in a medium bowl. Make a well in the center and add yogurt, salt, and ¾ cup water. Mix with a wooden spoon until a shaggy dough forms. Turn out dough onto a lightly floured surface and knead, adding more all-purpose flour as needed, until dough is smooth, elastic, and no longer sticky, 8–10 minutes. Dust with more all-purpose flour, wrap in plastic, and let rest at least 1 hour at room temperature. Divide dough into 12 pieces. Working with 1 piece at a time and keeping the other pieces covered with plastic wrap, roll out on a lightly floured surface to 8" rounds (if dough springs back when rolled, let rest a few minutes before proceeding). Heat a dry large skillet, preferably cast iron, over medium-high heat. Cook a round of dough until lightly charred in spots and browned in others, about 30 seconds per side. Transfer to a wire rack. Repeat with remaining rounds. Do Ahead: Chapatis can be cooked 45 minutes ahead. Wrap in foil and keep warm in a 250° oven.