Combine all the seasonings: salt, oregano, garlic powder, onion powder, rosemary, sage, and pepper in a small bowl.
Pat the turkey breast dry with a paper towel, then rub the seasoning mixture on the pork loin, making sure to cover each side.
In a small mixing bowl or 2-cup measuring cup, add chicken broth, garlic, molasses, olive oil, and Dijon mustard. Whisk together until well combined.
Place the turkey breast in the instant pot, add the sauce, and secure the lid with the vent set to "Sealing". Pressure cook on HIGH for 25 minutes. Allow a Natural Release for 10-15 minutes, then manually release any remaining pressure.
To make the gravy for the turkey, remove the liquid from the Instant Pot; it should measure to about 2 cups. Add butter and set the Instant Pot to Saute. Gradually add the flour to thicken, creating a roux. Slowly whisk back in the sauce, followed by 1 cup of chicken broth (you should use about 3 cups of fluid between the sauce and the chicken broth). Cook until desired thickness.
Slice the turkey and serve with gravy.