Green Chile Enchiladas

Name: Green Chile Enchiladas
Ingredients: 2 tablespoons canola oil; 2 teaspoons ground cumin; 1 yellow onion, seeded and chopped; 1 poblano chile, chopped; 1 teaspoon kosher salt, divided; 1 cup fresh or frozen corn kernels (from 2 ears); 1 15-oz. can black beans, drained and rinsed; 6 ounces Monterey Jack cheese, shredded (about 1½ cups), divided; 1 ⅓ cups tomatillo salsa or salsa verde; 1 4.5-oz. can chopped green chiles, drained; ¾ cup packed fresh cilantro leaves, plus more for serving; ½ cup sour cream, divided; 8 6-in. corn tortillas