Chicken Chili Verde

Name: Chicken Chili Verde
Ingredients: 2 (15 ounce) cans no-salt-added pinto beans, rinsed, divided; 1 tablespoon canola oil; 1 ½ pounds boneless, skinless chicken thighs, trimmed and cut into bite-size pieces; 2 cups chopped yellow onion (1 medium); 2 cups chopped poblano peppers (2 large); 5 cloves garlic, chopped (about 1 1/2 tablespoons); 4 cups unsalted chicken stock; 1 ½ cups prepared salsa verde; ½ teaspoon salt; 2 cups frozen corn kernels (about 12 ounces); 2 cups chopped spinach (about 2 ounces); 1 ½ cups coarsely chopped fresh cilantro; 6 tablespoons sour cream