Sheet Pan Indian-Spiced Chicken

Ingredients

• 1 red onion, sliced
• 5 limes
• 3¼ pounds potatoes, peeled and chopped into 1-inch pieces
• 2 teaspoons cumin seeds
• 2 teaspoons fennel seeds
• 2 teaspoons yellow mustard seeds
• 2 teaspoons nigella seeds
• ½ teaspoon ground turmeric
• 4 garlic cloves, peeled and minced
• 3 teaspoons kosher salt, divided
• 12 skin-on, bone-in chicken thighs
• 2 tablespoons extra-virgin olive oil
• Cilantro, for serving