Pre-heat oven to 350 degrees; Grease a 9×9 brownie pan or baking dish with cookie spray or butter OR line it with parchment paper; set aside
In a small bowl, whisk together flour and salt; set aside
Melt butter and chocolate in large sauce pan over low to medium heat; stir in sugar; stir in eggs, espresso and vanilla until smooth
Whisk in flour mixture just until combined; do not overmix; fold in peppermint baking chips
Pour batter into prepared baking dish and bake 33-36 minutes or until a knife comes out clean
Set brownies aside to cool completely before slicing and serving
Note: These brownies are great for making in advance of the holidays. Just wrap them tightly in foil and store them in the freezer for up to one month.