Preheat the oven to 400. Mix the diced sweet potatoes and olive oil on a rimmed baking sheet, and mix to coat the potatoes. Season with salt and pepper. Roast in the oven for about 15-20 minutes, until just turning golden brown on the corners.
Heat oil in a large skillet over medium heat. Add sausage to skillet and break sausage with a wooden spoon as it cooks. Stir frequently and cook until browned and no longer pink, about 5-10 minutes. Remove sausage with slotted spoon.
If needed, add a tablespoon of vegetable oil to the skillet. Add bell peppers, onion and garlic and cook until softened, about 5 minutes.
Add the potatoes, sausage, salsa, and cumin to the skillet. Stir and cook about 5 more minutes. Season with salt and pepper. Best served with rice, beans, avocado, and hot sauce.