Sweet Potato–Black Bean Stuffed Peppers

Name: Sweet Potato–Black Bean Stuffed Peppers
Ingredients: 6 small assorted-color bell peppers (about 6 oz. each); 1 tablespoon extra-virgin olive oil; 1½ cups chopped scallions , divided; 1 medium sweet potato , scrubbed and chopped (about 1½ cups ); 3 cups packed baby spinach; 1 (15-ounce) can no-salt-added black beans , rinsed; 1 (10-ounce) can no-salt-added diced tomatoes with green chiles, undrained; 1 (8.8-ounce) package microwaveable brown rice, prepared according to package instructions; 2½ tablespoons finely chopped fresh cilantro , divided; 1 teaspoon salt; 1 teaspoon garlic powder; 1 teaspoon ground cumin; 1 teaspoon smoked paprika; 2 cups shredded Colby-Jack cheese , divided