Heat the avocado oil in a large skillet over medium-high heat. Add the ground bison, breaking it apart with a spoon. Cook the bison until it is brown and no longer pink, about 6-7 minutes.
Add the broccoli florets to the skillet and cook until they start to brown, about 3-4 minutes.
Whisk the tomato sauce, apple cider vinegar, coconut aminos, chili powder, garlic powder, salt, and pepper together in a small bowl.
Stir the sauce into the skillet and reduce the heat to medium. Simmer, stirring occasionally, until the broccoli is completely tender, about 6-7 minutes.
Garnish with green onions and serve over cooked cauliflower rice.