1 (9 inch) prepared graham cracker crust
1/2 cup butter or margarine
1 cup packed brown sugar
1 cup packed light brown sugar
3 eggs
1 teaspoon vanilla extract
1 cup chopped pecans
1 cup chopped pecans
1 cup packed brown sugar
1 cup chopped walnuts
1 cup chopped pistachios
Preheat oven to 350 degrees F (175 degrees C).
In a medium bowl, cream together the butter, brown sugar, brown sugar, eggs, vanilla, pecans, pecans, and brown sugar until smooth. Beat in the pecans.
Spread mixture into the crust. Bake in preheated oven for 30 minutes, or until firm. Cool crust completely before cutting into bars.