Southwestern Corn Chowder

Ingredients

• 4 tablespoons unsalted butter
• 1 medium yellow onion, diced
• 1 red bell pepper, diced
• 1 jalapeño pepper, seeded, and finely diced (save the seeds and ribs; see note)
• ¼ cup all-purpose flour
• 2 cups chicken broth
• 2 cups whole milk
• 2 teaspoons salt
• 2 teaspoons ground cumin
• ½ teaspoon ground coriander
• 1 pound yellow, red or purple baby potatoes, cut into ½-inch pieces
• 3 cups fresh corn kernels, scraped from 4 to 5 raw cobs (see note)
• ⅓ cup sour cream
• 3 scallions, dark green parts only, thinly sliced
• 3 tablespoons fresh chopped cilantro
• 1 lime, cut into wedges, for serving