Cook the pasta according to the package.
Toss onions, green peppers, celery and mushrooms into the InstaPot. Add Olive Oil and seasonings. Close the lid and hit the Saute button. (this takes about 10 minutes)
Slice the Johnsonville Fully Cooked Sausage
Once the veggies are done, add the diced tomatoes, the can of stewed diced tomatoes and sausage into the InstaPot. Add additional seasoning for taste.
Hit the stew button on the InstaPot (this cooks for about 25 minutes)
Once you hear the chime on the InstaPot, your meal is complete.
Add the pasta to your InstaPot and mix thoroughly.
Serve.