Preheat oven to 375°F.
Heat a large skillet over medium-high heat and spray with cooking oil. Add in the onions and cook for approximately 2 minutes, and then add in the ground turkey. Be sure to break it up into small crumbles as it cooks.
When the meat is thoroughly cooked, add in the chili powder, garlic powder, cumin, and oregano. Season with salt/pepper to taste and set aside.
Use a small spoon to hollow out the center of the zucchini pieces, and then place them cut side up on a baking sheet.
Divide the meat mixture equally into the hollowed zucchini boats, followed by shredded cheese, corn, tomatoes, and black beans.
Bake for about 20-25 minutes or until cheese is melted and zucchini is tender.
Top with avocado, if desired, and Enjoy!