Preheat your oven to 350 degrees Fahrenheit. Spray a 9 by 13 inch baking dish with cooking spray and set aside.
In a large skillet for the enchilada sauce, heat 1 tablespoon oil over medium heat. Add 1 diced onion and 1/2 teaspoon kosher salt. Sauté until the onion is translucent, about 5 minutes.
1 tablespoon olive oil, 1 small yellow onion, 1/2 teaspoon kosher salt
Stir chili powder and cumin into the onion for the enchilada sauce and cook for about thirty seconds. Then stir in 1 tablespoon all purpose flour. Slowly whisk in vegetable stock. Then stir in the tomato sauce and minced garlic. Bring to a simmer and cook, stirring occasionally, for 5 minutes.
2 teaspoons chili powder, 1 1/2 teaspoons cumin, 1 tablespoon all purpose flour, 15 ounces tomato sauce, 1 cup vegetable stock, 2 cloves garlic
Transfer the enchilada sauce to a blender and blend to make smooth (optional). Pour 1/2 cup into the bottom of the prepared baking dish. Add the rest of the enchilada sauce back to the skillet you cooked it in.
In a large bowl, combine the black beans, sweet potatoes, salt, pepper, chiles, chili powder, cumin, garlic, and 1 cup of cheese.
15 ounces black beans, 1 sweet potato, 4.5 ounces diced green chiles, 2 garlic cloves, 1 teaspoon cumin, 1 teaspoon chili powder, 1/2 teaspoon kosher salt, 1/4 teaspoon black pepper, 2 cups shredded Colby Jack cheese
Working with one tortilla at a time, dip it in the enchilada sauce. Then add 1/4 cup of the black bean filling. Roll and place seam side down in the prepared baking dish. Continue with all 10 tortillas. Pour the remaining enchilada sauce over the top, and then top with the remaining cheese.
10 corn tortillas, 2 cups shredded Colby Jack cheese
Bake uncovered for 20 minutes or until the cheese is bubbly.