Line the bottom and sides of the baking pan with parchment paper, leaving an overhang on opposite sides to help remove the baked brownies from the pan.
Cream the melted butter and sugar together. Add eggs one at a time, beating between each addition. Add Hershey's chocolate syrup, vanilla extract, salt, and flour. Mix well and add to the greased pan.
Bake for 30-33 minutes or until done (start with 30). To test for doneness, insert a toothpick into the brownies; if the toothpick comes out with just a few moist crumbs, the brownies are done baking.
Allow the brownies to cool before cutting into squares. Enjoy!
Notes
When adding the flour mixture to the wet ingredients, fold gently until just combined. Over-mixing can lead to tough and dense brownies.
To ensure the brownies are baked perfectly, use the toothpick test. Insert a toothpick into the center of the brownies; if it comes out with a few moist crumbs clinging to it, they're done. If it comes out clean, they'll be less moist.
Allow the brownies to cool completely in the pan before cutting into squares. This allows them to set properly and makes for cleaner cuts.