Set oven to 375F.
Chop the ends off the zucchini, then scrape out the inside where the seeds are using a spoon.
Set a nonstick skillet on medium heat and spray with olive oil. Add garlic and red onions and cook until the red onion turns brown. Be careful not to burn the garlic in the process.
Add the ground bison to the skillet and begin to chop it up in the pan using a spatula. Then add the seasonings. Chop and cook until there are no more visible pink (raw) pieces of meat.
Add the tomato sauce and stir together. Season to taste with sea salt & pepper, then reduce the heat.
Place the zucchini boats in a baking dish, add about 3 tablespoons of the meat mixture inside the hollow portions of each zucchini boat. Then top each boat with about 2 tablespoons of grated parmesan.
Bake in the oven for 25-30 minutes at 375F.
Garnish if you would like and enjoy!