Allow the prime rib to sit at room temp for about 2 hours to take the chill off. Preheat the Ninja Foodi on broil for 10 minutes.
Cut 6-8 slits in the fat cap on top about ½-1" deep and insert a garlic clove into each one. The garlic should not be sticking out too much.
Place sprigs of Rosemary and onion slices on the reversible rack in the low position. Place the prime rib on top. Place the rack in the Ninja Foodi and broil for 5 minutes per pound. Don't open the lid.
After the Ninja Foodi goes through the cool cycle and without opening the lid, select the Bake/Roast function and set the time based on weight and how you like your prime rib cooked. See Notes. Check a temperature halfway through cooking and adjust time as needed.
Once the internal temperature is 5° less than the way you want it cooked, remove the rack with the prime rib and allow it to rest for 10-15 minutes. Serve & Enjoy!
Cooking Guidelines: These are only guidelines, use a thermometer to check the internal temperature of your prime rib to ensure accurate cooking. 5 minutes per pound on broil, followed by 8-12 minutes per pound on Bake/Roast at 250°F/121°CTemperatures for Prime Rib
Medium Rare: 130-134°F/55-57°C
Medium Well: 145-154°F/63-67°C
Well Done: 155-164°F/68-73°C
** If you want to pressure cook your prime rib, see post for instructions