½ teaspoon salt, plus more to taste 1 pound Brussels sprouts, trimmed ½ stick butter ¼ cup all-purpose flour 2 cups milk ¼ teaspoon grated nutmeg 1 garlic clove, grated 1 tablespoon wholegrain mustard 1 cup freshly grated cheddar cheese pepper, to taste ½ cup panko breadcrumbs ½ cup freshly grated Parmesan ½ cup chopped walnuts 1 teaspoon dried thyme
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