Black Bean and Sweet Potato Enchiladas

Seriously heavenly.  I will be making these again and again!  A great Pinterest find from Real Simple Magazine.

1 28oz can whole peeled tomatoes
2 t chili powder
1 large onion, chopped
3 T canola oil
salt and black pepper, to taste
2 cloves garlic, chopped
1 15oz can black beans, rinsed and drained
1 medium sweet potato, peeled and coarsely grated
2 t dried oregano
1/2 lb cheddar, grated
8 6-inch flour tortillas
2 scallions, thinly sliced, white and green parts separated
2 c frozen corn

1. Preheat oven to 450degrees F.
2. In a blender, puree the tomatoes, chili powder, half the onion, 1 T of the oil, salt and pepper until smooth.
3. Heat 1 T of the remaining oil in a large skillet over medium-high heat. Add the remaining onion and half the garlic and cook until softened, 2 - 3minutes. Add the black beans, sweet potato, oregano, and salt and pepper. Cook, tossing frequently, until the sweet potatoes are tender, 4 - 6minutes. Transfer to a large bowl and let cool. Stir in 1 cup of the cheddar.
4. Spread 1 cup of the tomato mixture in the bottom of a 9 x 13" baking dish.
5. Roll up the bean mixture in the tortillas (about 1/2 cup each) and place the rolls seam-side down in the dish. Top with the remaining tomato sauce and 1 cup of cheddar. Bake on the top rack of oven until the cheddar is brown and bubbly, 10 - 15minutes.
6. Meanwhile, wipe out the skillet and heat the remaining T of oil over medium-high heat. Add the remaining garlic and the scallion whites and cook, stirring, until fragrant, about 1minute. Add the corn and salt and pepper. Cook, tossing frequently, until tender, 3 - 5minutes more.
7. Sprinkle the enchiladas with the scallion greens and serve with the corn.