Place the broth, garlic, salt and pepper into the Instant Pot liner. Add the pasta to the pot. All noodles should be covered with the broth. DO NOT STIR.
Cook on Manual HIGH for 6 minutes. Allow for a 6 min NPR before QR the pressure. Stir the noddles, some may be slightly stuck together, but that is okay. Once you add in the evaporated milk and warm through, all will be well.
Add the red pasta sauce to the Instant Pot and stir well.
Add the evaporated milk to the Instant Pot and stir well.
Turn the Instant Pot onto Saute HIGH until the sauce is bubbling.
Turn the Instant Pot off and gradually stir in the parmesan cheese then the mozzarella cheese. Stir until the cheese has melted completely and the sauce has thickened. The sauce will thicken more as it cools. Enjoy!