Set Instant Pot to sauté. Once hot, add your oil.
Add the chicken to your instant pot and season with sea salt and pepper.
Sear until nicely golden brown on both sides. Roughly break the chicken into chunks and remove it from the instant pot. Set chicken aside on a plate.
In a small bowl whisk the broth and flour together really well, and pour it into the instant pot where you just cooked your chicken.
With your instant pot on sauté, bring to a gentle simmer to deglaze, stirring constantly. Add chicken back into this mixture.
In a mixing bowl, stir together all remaining ingredients except for the spinach.
Pour this mixture over the chicken and stir well to combine everything.
Cover and seal the lid. Make sure the valve points to Sealed. Change setting to Manual and adjust time to 6 minutes on High Pressure.
When finished cooking, let naturally release for 10 minutes. Release the rest of the pressure using "quick release" and, after the pin drops, carefully remove the lid.
Add fresh spinach to your hot creamy chicken, then stir to combine just until your spinach is wilted.
Serve immediately with an extra sprinkle of Parmesan cheese if desired.
Enjoy!