01 - Set oven to 400°F and allow to reach temperature.
02 - Slice zucchinis in half lengthwise. Using a spoon, scoop out center seeds to create boats. Reserve 1/2 cup of scooped flesh and chop finely.
03 - Arrange zucchini halves in baking dish with cut side facing up. Brush with 1 tablespoon olive oil and season with salt and pepper.
04 - Heat remaining olive oil in large skillet over medium heat. Sauté onion for 2 to 3 minutes until softened. Add garlic and cook for 30 seconds.
05 - Stir in cherry tomatoes and chopped zucchini flesh. Cook until tomatoes begin to soften, approximately 3 to 4 minutes.
06 - Add cooked chicken, Italian herbs, red pepper flakes, salt, and pepper. Cook for 2 minutes, then remove from heat.
07 - Spoon chicken mixture evenly into prepared zucchini boats.
08 - Sprinkle mozzarella and Parmesan cheese over the top of each boat.
09 - Bake for 20 to 25 minutes until zucchini is tender and cheese is golden and bubbly.
10 - Remove from oven and garnish with fresh basil or parsley before serving.