Pour the water into a large mixing bowl. Add the flour, sugar, and yeast and stir briefly to combine. Add the salt, yogurt, and oil. Knead the dough for 8–10 minutes, until soft and smooth.
Cover the bowl and let the dough rise for about 1½ hours, or until doubled in size.
Divide the dough into 20 pieces and roll them into balls. Roll each ball into an oval about 4 inches long.
Melt the butter and stir in the garlic and chopped cilantro or parsley, if using.
Heat a skillet over medium-high heat and add a little oil.
Cook 3 naan at a time for 1–2 minutes on the first side.
Flip and immediately brush the cooked side with the seasoned butter.
Cook for another 1–2 minutes.
Flip once more and brush the newly cooked side with butter. Remove from the skillet.
Place the cooked naan under a clean kitchen towel and keep warm until ready to serve.
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Notes
For a garlic naan variation, add minced garlic to the butter before brushing.