Onion Naan

INGREDIENTS

• 3/4 whole milk
• 1 1/4-ounce envelope active dry yeast
• 1 sugar
• 3 1/2 all-purpose flour plus more for surface and hands
• 1 kosher salt plus more
• 1 small onion, finely chopped
• 1 whole-milk yogurt (not Greek)
• 2 melted ghee (clarified butter) or vegetable oil plus more