Chicken Khao Soi

INGREDIENTS

• 1 1/2 pounds skinless, boneless chicken thighs, halved lengthwise
• 2 14-ounce cans unsweetened coconut milk
• 2 cups low-sodium chicken broth
• 1 teaspoon curry powder
• 2 tablespoons vegetable oil
• 8 garlic cloves
• 2 medium shallots, halved
• 1/4 cup chopped cilantro stems
• Kosher salt
• 1 pound Chinese egg noodles
• 1 tablespoon ground turmeric
• 3 tablespoons (or more) fish sauce (such as nam pla or nuoc nam)
• 1 2" piece ginger, peeled, sliced
• Sliced red onion, bean sprouts, cilantro sprigs, crispy fried onions or shallots, chili oil, and lime wedges (for serving)
• 1 tablespoon ground coriander
• 1 tablespoon (packed) palm sugar or light brown sugar
• 4 large dried New Mexico or guajillo chiles, stemmed, halved, seeded