Preheat the oven to 400°F (200°C) and line a baking sheet with parchment paper. Wash and dry the sweet potatoes, then pierce each one with a fork. Rub them with 1 tablespoon of oil and place them on the prepared baking sheet. Bake for 45 minutes to 1 hour, or until tender when pierced with a knife.
4 medium sweet potatoes, 2 tablespoons vegetable oil
While the sweet potatoes are baking, heat the remaining oil in a large skillet over medium-high heat. Add the chopped onion and sauté until softened and translucent. Add the ground beef, breaking it up with a spoon, and cook for 7 to 10 minutes or until browned. Drain any excess grease, then stir in the taco seasoning, mixing well to coat the beef evenly.
½ pound ground beef, 1 ounce packet taco seasoning, 1 medium onion
Once the sweet potatoes are fully cooked, let them cool slightly before handling. Slice each one lengthwise about three-quarters of the way through, leaving the bottom intact. Use a fork to gently mash the flesh inside, creating space for the filling.
Spoon the seasoned beef mixture into each sweet potato, then sprinkle shredded cheese over the top. Add black beans and corn, distributing them evenly among the potatoes.
½ cup Mexican style blend cheese, 1 cup canned black beans, 1 cup canned corn
Garnish with chopped cilantro, salsa, sour cream, sliced avocado, and jalapeños. Finish with a squeeze of fresh lime juice and serve immediately.
2 tablespoons cilantro, 1 lime, ½ cup salsa, ½ cup sour cream, 1 avocado, 1 jalapeño