01 - Preheat the oven to 425°F and line a baking tray with parchment paper.
02 - In a large bowl, combine diced sweet potatoes and red onion with olive oil, cumin, smoked paprika, chili powder, salt, and black pepper. Toss until evenly coated.
03 - Arrange the seasoned vegetables in a single layer on the prepared tray. Roast for 25 to 30 minutes, stirring halfway through, until tender and golden.
04 - Heat a skillet over medium heat and sauté minced garlic for 1 minute. Add black beans and the roasted vegetables to the skillet, cooking for 2 to 3 minutes while stirring gently.
05 - Warm the flour tortillas in a dry skillet or microwave until pliable.
06 - Distribute the sweet potato and black bean mixture evenly among the tortillas. Top with grated cheddar cheese, chopped cilantro, and a squeeze of lime juice.
07 - Add avocado slices, salsa, and sour cream or Greek yogurt as desired. Fold in the sides and roll the tortillas tightly to form burritos.
08 - For a crisp finish, toast the burritos seam-side down in a skillet for 2 to 3 minutes.
09 - Serve immediately with additional salsa, sour cream, and lime wedges.