Set the Instant Pot to Sauté mode on High. Heat the olive oil and sauté the ground beef.
Add the onion and garlic to the pot and sauté for 2-3 minutes.
Stir in the red pepper flakes and tomato paste and cook for 1–2 minutes.
Pour in the vodka and deglaze the bottom to prevent the burn warning. Let simmer for 1 minute.
Top with dry pasta of your choice and pour in broth. Make sure pasta is mostly submerged, but do not stir.
Seal the Instant Pot, Pressure Cook on High for 5 minutes, and then quick-release.
Turn on Sauté mode again and stir in the heavy cream. When the heavy cream is hot, stir in the Parmesan cheese to thicken.
Garnish with parsley flakes and enjoy!
