Saute Sweet Potatoes: In a large stock pot (at least 5 quarts), heat 2 tablespoons oil over medium high heat until shimmery. Add the sweet potatoes and cook, stirring, for 4 minutes or until softened and starting to take on some color. Season lightly with salt and pepper while they cook. Transfer to a plate and set aside.
Brown Meat Mixture: In the same pot, heat the remaining 1 tablespoon oil over medium high heat until shimmery. Add the onion, jalapeno, and turkey and season lightly with salt and pepper. Cook, stirring and breaking up the meat as it cooks, until the turkey is cooked through and no longer pink, about 5 minutes. Drain off some of the excess liquid/grease and return to the hot burner. (Tip: I do this by holding the lid on top and cracking it just a little while draining the liquid into a bowl.) Add More Ingredients: Add the garlic, tomato paste, chili powder, cumin, paprika, and oregano (crush it in your hand first) to the pot and stir to coat the meat mixture. Cook for only 1 minute to release the flavors of those ingredients. Stir in chicken broth, diced tomatoes, black beans, the cooked sweet potatoes, 3/4 teaspoon salt*, and 1/4 teaspoon pepper.
Cook Chili: Bring the chili to a boil, reduce to a simmer, and cover with lid. Simmer for 20 minutes, stirring occasionally. If the chili is too thick, add in more broth as needed. (Do not cook longer or the sweet potatoes will disintegrate.) Remove from the heat and stir in the lime juice.
Serve: Taste and season with more salt or lime juice to your preference. Chili will thicken as it sits and cools slightly. Serve with your favorite chili toppings.
*Use 1 teaspoon salt, if you used reduced sodium broth.