Rinse the potatoes to remove any dirt or grit. Drain well and pat dry. Using a fork, pierce the middle of each potato.
In a small bowl, combine garlic powder, marjoram, rosemary, thyme, oregano, salt, and pepper. Set aside.
PRESS the SAUTE mode button on the Instant Pot. When HOT appears on the display, add butter and heat with the Instant Pot lid open until it begins to melt.
Add potatoes and cook, stirring regularly, for about 2 to 3 minutes or until lightly browned.
Add the garlic and herb mixture and cook, stirring regularly, until garlic is softened.
Add water or broth.
Press the CANCEL button to turn off saute mode.. Close and lock the lid and set the valve on the SEALING position. Pressure cook on HIGH for 7 minutes.
When finished, do a QUICK RELEASE.
Open lid and transfer potatoes to a serving platter. Serve hot.