Combine the flour, baking powder and salt in a bowl.
Melt the 1/2 cup of butter.
In a mixing bowl, mix together the eggs, brown sugar, vanilla, and melted butter.
Slowly add the flour mixture until blended.
Add the chopped pecans and blend.
Pour into a 9x13 or edge pan.
Bake at 350 degrees for 25-30 minutes.
Cut into squares.
Enjoy!