Whisk together eggs and next 4 ingredients. (Mixture will be lumpy.) Add buttermilk and vanilla, whisking until batter is blended.
Coat 8 (7- x 4- x 1 1/2-inch) oval baking dishes with cooking spray. Place 1 tablespoon butter in each dish.
Bake at 425° for 3 to 4 minutes or until butter melts. Place apple slices evenly into dishes; bake 5 more minutes. Spoon about 1/2 cup batter into each dish. Sprinkle evenly with brown sugar and 1/2 cup chopped pecans. Bake 20 more minutes.
Sprinkle pancakes with powdered sugar, and top with a scoop of vanilla ice cream; drizzle with Caramel Sauce, and sprinkle with chopped, toasted pecans.