Preheat your oven to 200°C (390°F). Slice each zucchini in half lengthwise and use a spoon to scoop out the centers, leaving about 1cm border to form little boats. Set the scooped flesh aside.
Finely chop the zucchini flesh. In a skillet over medium heat, add a splash of olive oil and sauté the chopped flesh until fragrant and slightly golden, about 3-4 minutes. This will bring out a subtle sweetness and aroma.
In a mixing bowl, combine the cooked grains, sautéed zucchini bits, grated cheese, chopped herbs, lemon juice, and a drizzle of olive oil. Season with salt and pepper to taste, then mix until well combined.
Stuff each zucchini boat generously with the prepared filling, pressing it in to fill all the space. Place the stuffed zucchinis upright in a baking dish. If desired, sprinkle breadcrumbs evenly over the top for a crunchy crust.
Drizzle a little more olive oil over each stuffed zucchini and place the dish in the oven. Bake uncovered for 25-30 minutes, until the zucchini is tender when pierced with a fork, the cheese is bubbling and golden, and the top is crisp and browned.
Remove from the oven and let rest for 5 minutes to allow flavors to settle. Serve warm, garnished with extra herbs if desired. Enjoy the comforting, savory flavors and the beautiful golden crust.