Preheat oven to 350 degrees F (175 degrees C). In the microwave or in a metal bowl over a pan of simmering water, melt butter and chocolate, stirring frequently until smooth. Remove from heat and set aside to cool.
Step 2
In a large bowl, beat eggs and sugar until light and pale, about 5 minutes. Fold in the chocolate mixture, coffee liqueur, Irish cream liqueur and vodka. Combine the flour and baking powder; stir into the chocolate mixture then fold in walnuts. Spread the batter evenly into a 9x13 inch pan.
Step 3
Bake for 25 minutes in the preheated oven, or until brownies begin to pull away from the sides of the pan. Cool before cutting into squares. Frost with a glaze of coffee flavored liqueur and confectioners' sugar or melted chocolate if desired.
