Meanwhile, in 2 quart heavy saucepan, heat sweetened condensed milk over medium heat 5 to 8 minutes, stirring constantly until hot and mixture is thin. Remove from heat. Stir in peanut butter and chocolate hazelnut spread until well blended. Spread over baked crust. Sprinkle with remaining 3/4 cup coarsely chopped pretzels. Bake 15 to 20 minutes longer or until edges are golden brown. Cool completely, about 1 1/2 hours. Drizzle with caramel syrup. Cut into 6 rows by 4 rows. Store covered.