Best Chili Cheese Sweet Potato Casserole Recipe - How to Make Sweet Potato Casserole

Ingredients

• 4 tbsp. neutral oil, divided, plus more for dish
• 3 medium sweet potatoes (about 1 1/2 lb. total), peeled and cut into 1/2" cubes
• 2 tsp. kosher salt, divided
• 1 yellow onion, finely chopped
• 1 red bell pepper, seeds and ribs removed, finely chopped
• 2 cloves garlic, finely chopped
• 1 tbsp. chili powder
• 1 tbsp. ground cumin
• 1 tsp. dried oregano
• 1 (14.5-oz.) can black beans, drained and rinsed
• 1 (14.5-oz.) can diced tomatoes
• 1 (14.5-oz.) can tomato sauce
• 1 c. fresh or frozen corn kernels
• 2 c. shredded colby Jack cheese
• 2 scallions, sliced (about 1/4 cup)
• Sour cream, for serving