Make Ahead
Assemble dessert as directed; cover. Refrigerate several hours or overnight. When ready to serve, heat oven to 350°F. Bake dessert, uncovered, 1 hour or until knife inserted in center comes out clean.
Shortcut
Omit sour cream, COOL WHIP and maple-flavored syrup. Top each serving with a light drizzle of warmed caramel ice cream topping.