In large bowl, mix filling ingredients. Pour into crust-lined pie plate. Bake 15 minutes. Reduce oven temperature to 350°F. Bake 25 minutes longer. Meanwhile (during last 5 minutes of bake time), in 1-quart saucepan, mix brown sugar, corn syrup and butter. Heat to boiling over low heat. Reduce heat; simmer 2 minutes. Remove from heat; stir in vanilla. Sprinkle nuts evenly over pie; drizzle with topping mixture.