Stir in the remaining vegetables, the sausage, and a large pinch each of salt and pepper. Cook, stirring occasionally, until the sweet potato is tender and cooked through, 12 to 14 minutes. Season with salt and pepper, to taste.☞ TESTER TIP: If you find that the vegetables are starting to stick or brown too quickly, cover the skillet with a lid for about 5 minutes to help the vegetables steam and soften.