From The Wednesday Baker
Preheat oven to 350º. Grease 9 inch baking pan and line with parchment paper or foil.
In a saucepan melt the chocolate with the butter over low heat or use a double boiler. In a large mixing bowl combine the sugar with the eggs and beat until light in color. Add the melted chocolate. Mix. Sift the flour, baking powder, salt and add to the batter and mix well.
Turn into baking tin and bake for 30 minutes or until the top springs back when touched lightly in center, and the edges begin to pull away. Cool in pan, and when cold, brush the top with the tablespoon of Kahlua. Allow this to set for a bit before cutting brownies.