Peel, wash and chop the potatoes.
Add to the Ninja Foodi pressure cooker bowl.
Add 250ml of water (minimum!)
Pressure cook for 3 minutes. Use the quick release setting too.
Drain your potatoes, discard the water.
Shake the drained potatoes in the pressure cooker pot. This will rough up the edges a little.
Transfer the potatoes to the air fryer basket.
Air fry on 190C for 10 minutes using the air fryer or air crisp setting.
Mix together the marmite and oil. Use ½ teaspoon of water to loosen slightly if you feel it is needed.
Pour over the mixture and then mix well.
Air fry at 200C for 6-8 minutes using the air crisp setting again. Shake after 3-4 minutes to avoid the potatoes sticking to the air fryer basket.
Depending on the size of your potato you may need a few more minutes. Exercise your common sense here - if they're not crispy then they're not fully cooked!
I find that 18 minutes is perfect for the size of potato that I like to serve to my family.