Asiago Mac and Cheese with Truffled Potato Crust - SippitySup

Ingredients

• 1 pound dried penne pasta
• 1½ pound idaho russet potatoes
• 1 tablespoon unsalted butter
• 1 teaspoon white truffle oil
• 2 scallions, white & light green parts, minced
• 1 pinch each, kosher salt and freshly cracked pepper, plus more as needed
• 4 large eggs, lightly beaten
• 2 large egg yolks, lightly beaten
• 2 cups asiago cheese, grated
• ¼ teaspoon freshly grated nutmeg
• 1 shallot, peeled & minced
• 3 cups lightly packed shredded tuscan kale
• 4 ounces sliced prosciutto
• 12 sage leaves, minced
• ¼ cup parmesan cheese, grated, plus more for passing
• 2 cups half and half
• ¼ teaspoon crushed red pepper flakes
• 1 tablespoon vegetable oil