Preheat oven to 350 degrees F. Prepare 9 x 13 pan with non-stick spray.
Cream butter and sugar.
Add eggs one at a time, mixing well between additions.
Add syrup, salt and flour.
Mix well and pour into prepared pan.
Bake for 30 min.
Mix all ingredients for the mint layer and spread onto cooled brownies.
Put 6 T. butter and chocolate chips in a microwave safe bowl.
Cook in microwave on high for 1 min.
Stir well until it is melted and combined. Cool slightly.
Spread over mint layer.
May be refrigerated and served cold.