Lightened Up Zucchini Gratin

Ingredients

• 1 tablespoon unsalted butter, room temperature, plus 1 1/2 tablespoons
• 1 large shallot, finely diced (about 1/4 cup)
• kosher salt and freshly ground black pepper
• 2 medium cloves garlic, finely chopped (about 2 teaspoons)
• 1/3 cup dry white wine, such as sauvignon blanc
• 1/4 cup crème fraîche
• 6 medium zucchinis, diagonally sliced 1/2-inch thick
• 1 tablespoon chopped fresh thyme
• 1 tablespoon chopped fresh mint
• 1 tablespoon chopped fresh flat leaf parsley
• 1 cup fresh breadcrumbs
• 1/3 cup finely chopped walnuts
• 1/2 cup grated gruyère
• 1/2 cup grated parmigiano reggiano
• drizzle of extra virgin olive oil (optional)