Grease 9" square pan well; line with foil.
Preheat oven 350°. Resift flour with baking powder and salt.
Melt butter with chocolate over low heat.
Beat eggs with sugar until light. Add flour mixture,
chocolate mixture, and 1/4 C Kahlua; blend well. Stir in nuts.
Turn into prepared pan. Bake 30 min., or until top springs back
when touched lightly in center, and edges begin to pull away from pan.
Remove from oven; cool thoroughly in pan.
Brush top with 1 Tbsp. Kahlua. Cut into 1 x 2 in. bars.
Garnish, if desired.