Place the meatballs at the bottom of your pressure cooker.
Pour over 3 cups of water.
Add in the pasta.
Next, pour over 48 oz. of the marinara sauce and sprinkle on the red pepper flakes.
Lightly mix the sauce and pasta to coat.
Place the lid onto the pressure cooker and select lock/sealing.
Select the manual setting for 7 minutes.
When cooking has completed, set the lid to the venting option and perform a manual release of pressure. Stir to mix.
Sprinkle the Parmesan cheese over the penne and meatballs and enjoy!