Preheat oven to 350 degrees. Cook veggies and seasonings until potatoes and carrots are soft. While veggies are cooking, cook pasta. Place the nutritional yeast and oil in blender and blend adding the cooled seasoned vegetables and more water if needed. Adjust salt as needed. Will possibly need to blend in 2-3 batches. Pour the sauce over the pasta and mix. Place in the oven and bake for 30 minutes.