Brownies:
Melt butter and chocolate together. Add coffee powder.
Stir in sugar, eggs, vanilla, and salt, mix well.
Add
flour and stir to combine. Stir in chocolate chips and
nuts.
Pour
into a greased 9 inch square pan. Bake at 325 degrees
F. for about 40 minutes. Cool completely before icing.
Icing:
In a small bowl beat the butter until light and fluffy.
Gradually beat in icing sugar, and continue beating
until smooth. Beat in liqueur to combine.
Spread
icing over the cooled brownies. Sprinkle cinnamon over
top. Cut into squares. Store in the refrigerator.