Select ‘saute’ function on instant pot. When the screen reads ‘hot’, add 3 T olive oil and then add ground turkey. Cook, breaking up with the back of your spoon until turkey is fully cooked through. Season well with salt and pepper.
Add onion and garlic and sauté another minute or two, until garlic is fragrant and onion translucent.
Pour entire jar of marinara into instant pot.
Add 2 c water into empty marinara jar and give it a good shake; then pour into instant pot and stir.
Add pasta to pot and gently prod the top of it so its just covered but do not stir it!
Press cancel on the instant pot. Secure the lid, set the steam valve to “sealing” and cook high pressure for 8 minutes.
When the cooking time is up, release the pressure by gently moving valve to “venting” and let all steam release.
Remove the lid and give it a big stir. If you are adding spinach, add it in now and stir it up.
Serve warm in bowls. Option to add grated Parmesan and red pepper flakes.