Place the 1. 5 lbs (24 oz / 680g) of baby spinach directly into the stainless steel inner pot of your Instant Pot, then pour in the 0. 25 cups (2 fl oz / 60g) of veggie stock and 1 tbsp. or 3 tsp. (0. 5 fl oz / 15g / 0.53 oz) of balsamic vinegar.
Sprinkle the 1 tbsp. (0. 5 oz / 14g) of chopped walnuts and 1 tbsp. (0. 1 oz / 3g) of chopped chives over the greens.
Secure the Instant Pot lid, turn the venting knob to the Sealing position, and select Manual or Pressure Cook mode on High pressure for 7 minutes.
When the cooking timer goes off, allow the pot to sit undisturbed for a 5-minute natural pressure release, then carefully switch the valve to Venting to release any remaining steam.
Remove the lid, give the Balsamic Glazed Spinach a gentle stir to coat the leaves evenly in the tangy glaze, and serve warm.