While the fresh broccoli is in the pressure cooker roasting, do not stir until the liquids have been added.
Start with the lesser amount of cheese and add more for cheese lovers.
If you want to use packaged frozen broccoli (but why would you, when fresh is sold all year around in stores), skip the first step and just dump all ingredients except cheese the pressure cooker and set the cook time.
If using anything other than full fat cream, add it in after pressure is released. Otherwise, it will curdle and become not edible.