Preheat the oven to 350°F. Slice zucchini in half lengthwise, scooping out the seeds and part of the zucchini flesh. Leave about ¼-inch of zucchini along the skin of each halved squash.
Place the zucchini halves on a large baking sheet, drizzle with oil and rub with your hands to coat. Season with salt and pepper. Bake for 15 minutes.
In a large skillet, melt a tablespoon of butter over medium-high heat. Add the bread crumbs and stir quickly to coat. Saute while stirring frequently, for about 2 minutes, until toasted. Remove from the heat, transfer to a plate, and let cool.
While the zucchini is baking, combine the pasta sauce, red pepper flakes, Italian seasonings, garlic and onion powders in a small bowl and stir to combine.
Place the chicken in a medium-size bowl and add ¾ cup of the seasoned pasta sauce, reserving ½ cup for topping. Stir to coat the chicken and then stir in 1 cup of shredded cheese.
Remove the zucchini from the oven and generously fill each zucchini half with the saucy chicken mixture, using all of the filling. Drizzle 1 tablespoon of sauce over each chicken-filled zucchini boat. And top each zucchini with the remaining cheese.
Sprinkle generously with the toasted bread crumbs and bake for about 5 minutes, until the cheese has melted. Remove from the oven and serve warm.