Preheat your oven to 375°F (190°C).
In a skillet over medium heat, cook ground turkey until browned, breaking it apart as it cooks (about 5-7 minutes). Drain excess fat if needed.
Add chopped onion, bell pepper, and garlic to the skillet. Sauté until the vegetables are tender, about 5 minutes.
Stir in corn, black beans, ½ cup of enchilada sauce, cumin, chili powder, salt, and pepper. Cook for another 3-4 minutes until heated through.
Spread ¼ cup of the remaining enchilada sauce on the bottom of the baking dish.
To assemble the enchiladas, place about ¼ cup of the turkey mixture in each tortilla. Roll them up tightly and place seam-side down in the prepared baking dish.
Pour the remaining enchilada sauce over the top of the rolled tortillas. Sprinkle with shredded cheese.
Cover the dish with aluminum foil and bake for 20 minutes. Remove the foil and bake for an additional 5 minutes, or until the cheese is bubbly and golden.
Remove from the oven and let it cool for a few minutes. Garnish with fresh cilantro, if desired.