Turn to saute and add your olive oil, diced onion, sausage, salt and taco seasoning. Cook until meat is broken up into smaller pieces and no longer pink. Then press stop.
Add can of diced tomatoes and stir and spread meat out on to the bottom of the pot. Sprinkle your uncooked noodles over the top of this layer, then pour the broth over the top of everything, do not stir.
Close your lid and steam valve. Press the pressure button for 4 minutes. Do a quick release, lift lid, stir and set to saute once again.
Stir in sour cream and 3/4 c of cheese until cheese is melted and taco pasta starts to bubble and thicken. Cook until noodles are as tender as you'd like them to be. Then press stop and serve with remaining cheese on top of bowls.