Remove the turkey from the packaging. Place on on a baking dish.
Rub the seasoning mixture all over the turkey breast.
Place into your fridge, uncovered for at least 24 hours. 48 would be even better.
Add the onion, garlic, and 1 cup of turkey stock to your Instant Pot. Place the trivet into the pot.
Remove the turkey breast from the fridge and place it into the Instant Pot.
Set to high pressure for 35 minutes. Set to sealing.
Allow for natural release.
Remove the turkey from the Instant Pot and place it onto a sheet pan.
Turn on the broiler of your oven. Place the turkey inside so that it doesn't touch the heating element.
Cook until the skin is brown and crispy, rotating the pan if necessary. Don't not leave the area while doing this.
Allow 20 minutes for the turkey breast to rest before carving.