In your Instant Pot, add the chicken broth, heavy cream, marinara sauce, vodka, garlic, salt, pepper, and noodles. Do not mix the sauce, but make sure that your noodles are as covered as possible by the liquid ingredients.
Set your Instant Pot to manual HIGH for 6 minutes. Once the pressure has built and the Instant Pot has cooked for 6 minutes, allow 6 minutes of a natural pressure release. Then quick release the rest of the pressure.
Open the lid of the instant pot and allow the steam to clear. Then, add the grated parmesan cheese, 1/4 cup at a time. Mix until the cheese melts and makes the sauce thicker. Enjoy!
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