Cookie Crust: In a small bowl, cream butter and sugar.
In a separate bowl, combine flour, salt, baking powder.
Add to butter/sugar mixture.
(The original directions specify that the butter and sugar should be creamed together with a wooden spoon, by hand; and the flour mixture should also be worked in by hand.
I don't do that -- I use my Kitchenaid mixer).
Pat into bottom of a 13 x 9 pan.
Bake 10 minutes or until golden.
Cool on wire rack.
Filling: In a small bowl, beat eggs until light with an electric mixer.
Gradually beat in sugar.
Add vanilla, flour, salt, and baking powder; beating just until combined.
Stir in coconut and nuts.
Spread evenly over cooled crust.
Bake 25 minutes or until golden and firm to the touch.