Pour chicken broth, garlic, salt, pepper, and penne pasta into Instant Pot. Secure the lid, switch the knob to "sealing" and cook on "manual" for 5 minutes.
When it is done cooking, let the pot do a natural release for 5 minutes.
Remove the lid and pour in evaporated milk and marinara sauce. Stir the sauce into the pasta so that all the pasta is covered evenly.
Add in Parmesan cheese and mozzarella cheese and stir until cheese is melted.
Serve immediately and top with fresh basil and Parmesan cheese if desired.
Notes
If you want to add protein to this, you could add cooked and shredded chicken at the end or cooked and crumbled Italian sausage.Recipe adapted from Cooking with Karli