Preheat oven to 375°F.
Slice pork tenderloin from one end to the other, inserting the knife about ⅔ of the way in to create a pocket
Place pork on aluminum foil covered sheet pan.
Season pork lightly with salt and pepper.
Mix ingredients for stuffing together and press into pork evenly from end to end.
Mix ingredients for gf breadcrumb crust together and press onto pork, covering up the stuffing mix.
Bake for 25 minutes, or until thermometer inserted into thickest part of pork reads 145°F.
Rest for 5 minutes before slicing. Happy eating!