Mashed Sweet Potato Casserole with Bourbon

"Bourbon adds a complex, woody flavor to this twist on the holiday sweet potato casserole, keeping things from veering off into kids’-table territory. Roasted sweet potatoes are mashed so they stay chunky, then mixed with melted butter, bourbon, milk, some cinnamon and nutmeg, and orange zest for loads of flavor without being too boozy-tasting. This glorious mash is packed into a buttered casserole dish, and topped with a pecan-and-brown-sugar streusel that turns crunchy as it bakes. Shopping note: Garnets (also known as Sweet Garnets or Red Yams) have bright, orangey-red flesh, a moist texture, and moderate sweetness. Make-ahead note: Though the streusel is crunchiest when freshly made, this casserole can be completely made ahead, covered, and refrigerated for up to 2 days. Reheat uncovered in a 350°F oven until heated through, 35 to 45 minutes. For more inspiration, check out our Baked Ginger Sweet Potatoes, Baked Sweet Potato with Molasses-Clove Butter, and Maple Mashed Sweet Potatoes...."