Pre-heat oven to 350°F.
Grease the bottom of a 9 x 13-inch pan or jellyroll/brownie pan.
In a medium bowl, add melted butter and sugar; cream together.
Add eggs, one at a time; beating well after each addition.
Add vanilla extract and flour; mix well.
Add Hershey syrup; mix well.
Add chopped nuts, if using; pour batter into pan.
Place in pre-heated oven and bake for 35 - 40 minutes or until brownies test done with a toothpick.