In a large skillet on medium heat, add in oil and cook smoked sausage until brown on both sides.
Remove smoked sausage from the skillet and add in the onions and frozen vegetables. Cook until veggies are soft and tender. Add in the soy sauce and season with garlic powder and salt/pepper to taste.
Toss in the smoked sausage and pasta and add in ¼ cup of water if needed to loosen up the pasta.