Roasted Fish With Cumin Sweet Potatoes

Name: Roasted Fish With Cumin Sweet Potatoes
Ingredients: 1 lb sweet potatoes, peeled and sliced 1/4 thick; 1/2 tsp ground cumin; 1 tbsp canola oil; 4 catfish or other fish fillets (4--6 oz each); 1 tsp chili powder; 1/2 C diagonally sliced scallions; 1 bag (10 oz) frozen corn kernels, thawed; 1 med green bell pepper, seeded and chopped; 2 tbsp fresh lime juice; 1 tbsp chopped cilantro; 1 tsp finely chopped jalapeno chile pepper, or more to taste