Pre-heat oven to 400 degrees. Drizzle chopped sweet potatoes with olive oil. Sprinkle with salt & black pepper. Roast till potatoes are slightly crisp on the outside and soft on the inside.
While potatoes are roasting prepare the black beans and rest of the veggies.
Saute diced red onions in olive oil until onions are softened. Add minced garlic and cook on low heat for another couple minutes. Add cooked beans and spices. Add olive oil if needed while simmering till beans are hot and flavors of spices are blended with the beans.
Besides steak, chorizo is my husband's favorite meat so many times if I make taco bowls I'll also cook some chorizo.