– 1 pound fresh Brussels sprouts, washed and trimmed (halved if large) – 2 tablespoons olive oil – ½ teaspoon kosher salt, plus additional for sprinkling – ¼ teaspoon ground black pepper, plus additional for sprinkling – ½ cup grated Parmesan cheese, divided – 1 large egg – 1 (17.3-ounce) package frozen puff pastry sheets, thawed – ¼ cup mayonnaise – 3 tablespoons Dijon mustard – 2 tablespoons maple syrup – ½ teaspoon apple cider vinegar
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