Set your instant pot/pressure cooker to the "Sauté" setting. Once heated up, add the olive oil. Once glistening, add the minced garlic and cook for about 1 minute, stirring frequently. Then add the onion and cook until it starts to become soft and slightly translucent.
Push the onions and garlic to the side and add the ground turkey to the pot. I like to let it brown a bit before breaking down, but you can break it into small pieces as desired. Cook until browned and no longer pink inside.
Once the turkey is fully cooked, turn the Instant pot off. Add the broth, marinara sauce, Italian seasoning, salt and pepper and stir to combine.
Break the pasta in half (if you haven't already) and add to the pot, gently pressing down into the liquid. Add the cubed butter as well, and make sure it is in the liquid.
Close the Instant pot and set it to pressure cook for 2 minutes. (mine usually takes about 10-12 minutes to build pressure). Make sure the vent is turned to "sealing."
After the cycle is complete, do a quick release--hover a kitchen towel over the vent to keep from major splattering that can occur sometimes. Remove the lid, test the pasta. It should be JUST UNDER al dente and there will be a bit of liquid in the pot as well that will end up being absorbed.
Stir the pasta and allow it to sit in the mixture for a few minutes longer until it reaches al dente or your desired level chewiness and the sauce thickens up.
Serve with freshly grated parmesan, chopped basil and enjoy!