4 tablespoons unsalted butter, melted, divided, plus more for greasing
1 cup grated Parmesan cheese, divided
1/4 cup plain bread crumbs
2 tablespoons all-purpose flour
1 1/2 cups milk
2 cups shredded Gruyere cheese, divided
Kosher salt, to taste
3 medium zucchini, sliced into 1/4-inch coins
2 teaspoons chopped fresh thyme
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