Twice-Baked Butternut Squash

Check 1 (3- to 3 ½-pound) butternut squash

Check ¼ cup water

Check 2 (8- to 9-ounce) sweet potatoes

Check 3 ounces cream cheese, softened

Check 5 tablespoons unsalted butter, melted

Check 1½ teaspoons table salt

Check ¾ teaspoon freshly grated nutmeg

Check ½ teaspoon black pepper

Check 3 tablespoons shredded sharp Cheddar cheese

Check 3 tablespoons grated fresh Parmesan cheese

Check 1 tablespoon minced fresh chives