Preheat oven to 325º
Grease 9 x 13 pan
Combine flour with baking powder and salt and set aside.
Combine water, sugar and butter and bring to a boil stirring constantly.
Remove from heat and stir in chocolate chips and vanilla.
Beat until smooth, add in eggs, stirring well.
Add flour mixture and chopped nuts.
Spread in pan and bake 25 minutes.
Sprinkle with bourbon while still hot.
Cream butter and sugar, then add the creme de menthe.
Spread over brownies.
Chill until set.
Melt chocolate chips with butter.
Spread over the creme de menthe layer.
When cool, cut into bars.