Remember to use frozen chicken for the Instant Pot Pressure Cook method and thawed chicken for the Slow-Cooker Method. My favorite marinara sauce is Hunts Garlic and Herb because it contains no added sugar. Also, I have made this before when my Instant Pot alerted me that it was beginning to burn. If this happens to you, simply press the [Cancel] button, carefully remove the lid, add 2 more Tablespoons of water, and give the chicken a few stirs. Replace the lid and resume to pressure cooking process.