Make the Naan Bread. In a liquid measuring cup, dissolve yeast and 2 teaspoons sugar in 1 cup warm water. Let stand about 10 minutes, until frothy. In a large bowl, combine the yeast, remaining ΒΌ cup sugar, yogurt, egg, salt, and enough flour to make soft dough, adding one cup at a time. (Important: Do not add the flour all at once.) When a dough ball can be formed, remove to a floured surface and knead for 6 to 8 minutes until dough becomes smooth. Place dough ball in a bowl, cover and let rise in a warm place for 1 hour.