Prepare your Brussel Sprouts. Chop the tops off them, remove any dead leaves and place a cross in the top of them. Thoroughly clean them with a sieve. Place your Brussel Sprouts into the bottom of the Instant Pot inner pot. Add 1 cup of water (250ml) and season the Brussel Sprouts with salt and pepper. Place the lid on the Instant Pot, set the valve to sealing and cook for 4 minutes on manual pressure.
When the pressure cooker beeps manually release pressure. Remove the Brussel Sprouts into a sieve with a bottom bowl to catch the liquid and put the Brussel Sprouts to one side once drained. Add the liquid back into the Instant Pot.
Place the Instant Pot on sauté and add to the Instant Pot your soft cheese. Keep stirring until it resembles a creamy, but slightly watery sauce. Add in grated cheese and mix until well melted.
Stir your warm Brussel Sprouts back in and load into a serving dish, grate extra cheese on top.
Notes
Add. You can also add breadcrumbs to the top of the gratin before reheating if you prefer.