In a large mixing bowl, blend the ground bison with the chopped shallot, olive oil, and all the seasonings.
Mix the ingredients with your hands until just combined, then shape the mixture into 4 equally-sized burger patties, being careful not to overwork the meat.
Melt the butter in a cast iron skillet over medium heat, and cook the patties until they develop a rich brown crust on each side, about 8-9 minutes, or until the internal temperature reads between 130-135°F.
Serve your juicy bison burgers on your choice of buns with your preferred toppings.