Preheat oven to 350 degrees F. Prepare brownie mix as package directs; stir in nuts. Spread into well-greased 13x9-inch baking pan.
In large bowl, beat cream cheese until fluffy. Gradually beat in sweetened condensed milk, egg and vanilla until smooth. Pour evenly over brownie batter.
Bake 40 minutes and until top is lightly browned. Cool. Chill. Garnish with chocolate syrup. Cut into bars. Store leftovers covered in refrigerator.
