In a large skillet, heat a drizzle of olive oil over medium heat. Add the chopped onion and bell pepper, and sauté for about 5 minutes until softened.
Add the minced garlic to the skillet and cook for an additional minute until fragrant.
Add the ground turkey to the skillet and cook until browned, about 6-8 minutes. Break it apart with a spatula as it cooks.
Season the mixture with smoked paprika, cumin, chili powder, salt, and pepper. Stir well to combine all the flavors.
Add the diced sweet potatoes, black beans, corn, and chicken broth to the skillet. Mix everything together until well incorporated.
Transfer the mixture to a greased 9x13 inch baking dish, spreading it out evenly.
Cover the casserole with aluminum foil and bake in the preheated oven for 25 minutes.
After 25 minutes, remove the foil and sprinkle the shredded cheese on top (if using). Bake for an additional 10-15 minutes, or until the sweet potatoes are tender and the cheese is melted and bubbly.
Once done, remove from the oven and let it sit for a few minutes before serving. Garnish with freshly chopped cilantro if desired.