1. Preheat oven to 400 degrees F. Line a baking sheet with aluminum foil, and place sweet potato cubes on top. Toss with smoked paprika, 1/2 T olive oil, and 1/8 tsp salt. Bake 20 to 25 minutes, or until sweet potatoes are soft. 2. Meanwhile, heat remaining 11/2 T olive oil in a large skillet over medium-high heat. Add onion and garlic and saute for 6 to 8 minutes, until onion is translucent, stirring frequently. Add chili powder, cumin, cayenne pepper, and 1/4 tsp salt, and saute for 60 seconds, until fragrant. Add beans, and reduce heat to medium-low. Cook beans for 10 minutes to let the flavors meld, stirring occasionally. Remove from heat. 3. Wrap tortillas together in aluminum foil and heat in oven for 3 to 5 minutes, or until warm. Remove and top with a spoonful of sweet potatoes and beans. Divide goat cheese crumbles between tacos, and add cilantro leaves. Finish with a squeeze of lime.