Preheat the oven to 400°F or 200°C. Wash and dry 4 medium zucchini, trim the end, and cut each zucchini into 3 slices.Arrange the slices on a baking tray lined with parchment paper, brush them with 2 teaspoons extra virgin olive oil, and season with ½ teaspoon salt and 2 twists black pepper.
Bake at 400°F or 200°C in the center rack of the oven for 15 to 20 minutes or until tender-crisp.Don't overcook the zucchini, or they will get mushy and watery.
Breadcrumbs Topping
To a small bowl, add ¾ cup breadcrumbs, 2 tablespoons extra virgin olive oil, ½ teaspoon dried thyme, 1 teaspoon dried rosemary, 1 teaspoon garlic powder, ½ teaspoon salt, and ¼ teaspoon black pepper.Mix well with a spoon or with the tips of your fingers.
Take the zucchini out of the oven, and add about a tablespoon of breadcrumbs mixture on top of the zucchini.
Put back in the oven, with the broiler function turned on, and gratin until the breadcrumbs get golden, toasted, and crunchy (1 to 3 minutes).
Arrange on a serving platter and enjoy as a starter or side dish.Serve with 1 handful flat-leaf parsley (chopped) and 4 wedges of lemon.