Season chicken with salt, pepper, garlic powder, and paprika. Brown on Sauté for 2–3 minutes per side if you like a little color.
Whisk mustard, honey, vinegar, olive oil, and broth in a bowl and pour over chicken in the pot.
Seal Instant Pot and cook on High Pressure for 8 minutes (thicker breasts may need 10). Let natural release for 5 minutes, then quick release remaining pressure.
Remove chicken to rest 5 minutes; switch pot to Sauté and simmer sauce 2–3 minutes to thicken if needed. Spoon sauce over chicken and garnish.