Preheat oven to 400 degrees F. In large bowl, combine olive oil, sweet potatoes, cumin, salt, garlic powder and onion powder. Toss to coat potatoes evenly. Spread mixture on baking sheet and roast for 30 minutes, stirring after 20 minutes.
In medium non-stick skillet, sauté kale about 3-5 minutes. Add beans, tomatoes and remaining spices and simmer for another 5-7 minutes until heated through.
Build taco bowl with 3/4 cup of sweet potatoes, 1 cup of bean mixture and desired toppings.