Preheat oven to 425° F and prepare a baking pan (lining with parchment paper or greasing with oil).
In a large mixing bowl, combine sweet potatoes, half of the red onion, bell pepper, olive oil, paprika and chili powder and mix well. Place onto baking pan and bake in oven for 10-20 minutes on each side until veggies are soft and potatoes are crispy. Salt & pepper to taste.
While sweet potatoes are cooking, combine all dressing ingredients in a medium mixing bowl or mason jar and wisk or shake to mix everything together. Set aside.
In a large mixing bowl, combine cooked sweet potatoes and veggies, kale, remaining raw red onion and dressing and toss until everything is evenly coated. Sprinkle with toasted pine nuts.