Preheat your oven to 400°F and line a baking sheet with parchment paper.
Peel and dice the sweet potato into half-inch cubes, then spread them on the baking sheet.
Season the sweet potato with half of the sea salt and black pepper, then roast for 20 minutes until tender and slightly browned.
While the potatoes roast, place a large pot over medium-high heat and add the ground turkey and diced yellow onion.
Cook the turkey until browned and the onion is translucent, breaking the meat into small crumbles as it cooks.
Add the minced garlic, chili powder, and ground cumin to the pot, stirring for 1 minute until fragrant.
Pour in the tomato puree, rinsed black beans, and vegetable broth, then bring the mixture to a gentle simmer.
Reduce heat to low and let the chili simmer for 10 minutes to allow the flavors to meld.
Stir the roasted sweet potato cubes into the chili and season with the remaining salt and pepper.
Serve hot in a bowl, optionally garnished with fresh cilantro or a squeeze of lime.