In a medium bowl combine the minced celery, scallion, mushrooms and parsley with the ground bison and the spices. Mix well with your hands.
Gently form 6 flat patties. They will shrink in size so depending on what kind of diameter you prefer, make them slightly bigger.
Heat a large pan/skillet over medium heat. Once hot add the cooking oil. Place the patties in the skillet and make sure there is enough space between them. You may have to use two pans or cook them in batches if your patties are large. Cook the patties for about 4 minutes on each side for medium/rare. Depending on how you like them cooked, increase the cooking time.
You can also grill them on a BBQ grill. Grill for a couple of minutes on each side until they reach the desired temperature.
See the options below for how to serve these patties. You can store them in the fridge in an airtight container for a few days. The patties taste great cold as well as a snack or for breakfast.