Press "saute' on your Instant Pot. Add in the oil or butter, and toss in the onion.
Stir the onion for a few minutes to soften, then add the broken spaghetti pieces to brown slightly, several minutes.
Add all the rice, seasoning mix, and chicken, stirring to combine.
Pour in the bone broth or chicken broth, stirring gently. Ensure no bits stick to the bottom...newer Instant Pots have a sensitive 'burn' notice sensor. If any rice kernels are on the side of the insert, shove them back in! Hit the 'cancel' button.
Lock on the lid and set 'manual' time for 5 minutes.
When the Instant Pot beeps, hit cancel, and let the it sit (natural release) for 10 minutes before releasing pressure to serve (it may have naturally released by this point anyways!)