Set your pressure cooker to SAUTE. Drizzle with oil, then add the ground beef and saute 4-5 minutes, breaking beef into pieces as it cooks, until browned.
Stir in Italian seasoning and garlic for 1-2 minutes longer.
Add marinara, water, broth, noodles, onion powder, and red pepper flakes to the pot and give it a good stir.
Place the lid on the pot and slide it into the locked position and turn the vent valve to the sealed position.
Set to PRESSURE COOK or MANUAL for 8 minutes.
When the cooking time is done, do a quick release (immediately turn the vent valve to VENT position) and remove the lid once the float valve drops.
Stir in the mozzarella cheese. Once the cheese is melted and incorporated, add salt and pepper to taste.
Dish up your pasta, top with parmesan cheese, and serve
