Mix warm water, sugar, and yeast; let sit until foamy
Combine flour, salt, and yogurt in a bowl
Add the yeast mixture and mix into a dough
Knead the dough until smooth and elastic
Cover and let the dough rise until doubled in size
Divide the dough into equal portions
Roll each portion into an oval or circle
Heat a skillet or pan over medium-high heat
Cook each naan on one side until bubbles form
Flip and cook the other side until browned
Brush with melted butter or ghee
Serve warm