In a large skillet, cook turkey, onion, shallot and garlic over medium heat until turkey is no longer pink and vegetables are tender, 8-10 minutes, breaking up turkey into crumbles; drain.
Add tomato paste; cook and stir 1 minute longer.
Add sweet potato, broth, smoked paprika, salt and pepper.
Bring to a boil; reduce heat.
Simmer, covered, until sweet potato is tender, about 10 minutes, stirring occasionally.
Add kale and red pepper flakes; cook and stir until kale is wilted, about 2 minutes.
Serve with avocado and, if desired, mint.