Set the Instant Pot to Sauté and add the ground beef.
Cook, breaking up the meat with a wooden spoon, until browned throughout, about 5 minutes.
Turn off Sauté and drain excess fat from the pot.
Stir in Stone House Seasoning, dried oregano, crushed tomatoes, and 4 1/2 cups water until combined.
Lay the broken spaghetti noodles on top of the meat and sauce, pushing them down so they are mostly submerged; add a little more water if needed to cover the noodles.
Secure the lid and cook on High Pressure for 8 minutes.
When the cook time completes, perform a quick release of the pressure according to the Instant Pot instructions, then remove the lid.
Stir the spaghetti thoroughly to combine sauce and noodles.
Serve portions topped with grated Parmesan cheese.