Loaded Sweet Potato Nacho Fries

Name: Loaded Sweet Potato Nacho Fries
Ingredients: 2 tablespoons extra-virgin olive oil; 2 medium sweet potatoes (about 1 1/2 pounds), cut into sticks about 1/4 inch thick; ¼ teaspoon salt plus a pinch, divided; 2 tablespoons reduced-fat sour cream; 1 tablespoon lime juice; 1 cup corn kernels, fresh or frozen; ½ cup shredded Cheddar cheese; ⅓ cup black beans, rinsed; ½ cup cherry tomatoes, halved or quartered if large; 2 scallions, sliced; 1 avocado, chopped; 2 tablespoons chopped cilantro (Optional)