Preheat oven to 400°F (200°C).
Pierce sweet potatoes with a fork and rub them with olive oil, salt, and pepper.
Bake sweet potatoes for 40 to 45 minutes until tender.
Heat 1 teaspoon olive oil in a skillet over medium heat.
Sauté diced onion for 3 minutes until softened.
Add minced garlic and cook for 30 seconds.
Add ground meat and cook until browned.
Stir in chili powder, cumin, paprika, oregano, salt, and pepper.
Mix in black beans, corn, and tomato sauce or salsa, then simmer for 5 minutes.
Slice open baked sweet potatoes and fluff the insides with a fork.
Spoon the taco filling into each sweet potato.
Top with diced avocado, Greek yogurt or sour cream, chopped cilantro, shredded lettuce, and lime wedges.
Serve warm with extra salsa on the side.