Heat the olive oil over medium heat in a large skillet. Add the onion, ¼ teaspoon salt, and stir to combine. Cook for 3 minutes, or until the onions soften, stirring occasionally.
Add the ground turkey, breaking up with the back of a spoon. Sprinkle with ½ teaspoon salt, cumin, garlic powder, and smoked paprika. Cook until the turkey is browned and cooked through, about 8 minutes, stirring occasionally.
Add the black beans, tomatoes, corn, and remaining ¼ teaspoon salt, stirring to combine. Turn to medium low and simmer for 5 minutes for the flavors to combine.
Sprinkle with cheese if using, then serve with optional serving suggestions if desired.