Turn on a multi-cooker (such as Instant Pot®) and the select Saute function. Melt butter in the pot. Saute onion, apple, and celery until onion and celery are slightly translucent, about 5 minutes. Add broth; scrape off bits from the bottom of the pot. Add gravy mix; stir until dissolved.
Combine kosher salt, thyme, rosemary, black pepper, sage, and garlic powder in a small bowl. Rub onto the turkey breast.
Lower a trivet into the pot; place seasoned turkey on top. Close and lock the lid. Select high pressure according to manufacturer’s instructions; set timer for 50 minutes. Allow 10 to 15 minutes for pressure to build.
Release pressure using the natural-release method according to manufacturer’s instructions, 10 to 40 minutes.
Mix water and quick-mixing flour together slowly in a bowl until slurry is smooth.
Unlock the lid and open the pot; transfer turkey to a plate. Strain the liquid from the pot; return it to the pot and select Saute function. Bring to a boil. Stir in the slurry slowly until gravy is thickened to your satisfaction. Slice turkey and serve with gravy.
After the turkey is done cooking, you can set it under the broiler until skin is crisped to your liking.
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