Turn on pot to the Sauté setting. Add the olive oil, sausage, Worcestershire sauce, and mustard.

Top with the eggplant and tomatoes.

Stir the mixture scraping the bottom of the pot to deglaze (get up any browned bits).

Pour the tomato sauce over the mixture and cover it completely. Do not stir.

Cancel the Sauté function. Put the lid on the pot and turn the steam release knob to the Sealing position. Press the

When the cook cycle is finished, do a Quick Release of the pressure/steam by turning the steam release knob to the

Venting position.

When the pin in the lid drops down, open the lid and stir the pasta. Stir in the cheese.

Close the lid and let the cheese melt.

Serve from the pot or transfer to a casserole serving dish.