The present invention relates to a process for preparing an edible foodstuff from food industry waste stream byproducts. This process involves the steps of: (i) combining, in an extruder, an extrusion formulation comprising a first food byproduct and at least one additional ingredient； (ii) introducing supercritical carbon dioxide (SC—CO2) into the extruder to mix with the first food byproduct and the at least one additional ingredient； and (iii) producing an edible foodstuff containing the first food byproduct and the at least one additional ingredient, where the edible foodstuff comprises an extrudate prepared under supercritical fluid extrusion (SCFX) conditions. The present invention also relates to a process for preparing an edible foodstuff from a protein concentrate. The present invention further relates to edible foodstuffs produced by the various processes disclosed herein.
