Step 2

Preheat the oven to 350°F. Grease a 9-by-14-by-2-inch oval baking dish with 2 tablespoons of the melted butter and set aside.

Step 3

Heat 2 tablespoons olive oil in a large (12-inch) skillet over medium-high heat. Add the scallions and zucchini, and sauté for 2 minutes. Add the garlic and cook for 1 minute. Lightly press most of the water out of the spinach and add it to the pan. Add the rice, basil, parsley, nutmeg, lemon juice, 2 teaspoons salt and 1 teaspoon pepper; toss well. Transfer to the prepared baking dish.

Step 4

In a medium bowl, whisk together the eggs, cream, the remaining 2 tablespoons melted butter and the ¼ cup Parmesan. Pour the mixture over the spinach and zucchini; smooth the top. Sprinkle with some extra Parmesan and the Gruyère. Bake until a knife inserted in the center comes out clean, 20 to 30 minutes.