Preheat oven to 350 degrees F.
Spread about half of the 10 ounce can of enchilada sauce on the bottom of a 9x13" baking dish. Note: you can also make this in two 8x8" baking dishes, if you want a smaller portion, and one to freeze later.
In a large skillet over medium heat, add the olive oil and turkey, and brown the ground turkey, breaking it into small chunks as it cooks.
Add chili powder, cumin, garlic powder, the remaining enchilada sauce, corn, black beans, and diced tomatoes and stir well to combine.
Layer half of the corn tortillas on top of the enchilada sauce.
Top with half of the turkey enchilada filling, followed by half of the cheese.
Repeat the tortilla layer, enchilada filling layer, and then top with the remaining cheese.
Bake in the preheated oven for 30-35 minutes. If you make it in an 8x8" dish, you can decrease the baking time to 25 minutes.