2 1/4 cups all-purpose flour
1 teaspoon baking powder
1/4 teaspoon salt
3/4 cup margarine, melted
2 1/4 cups brown sugar
1 1/2 teaspoons vanilla extract
4 Butterfinger candy bars, crushed
Preheat oven to 350 degrees F.
In a small bowl, combine flour, baking powder and salt; set aside.
In a medium bowl, with electric mixer at medium speed, combine margarine and brown sugar. Beat in eggs and vanilla extract until smooth. Stir in flour mixture and 1 cup crushed Butterfinger bars.
Spread in a greased 13 x 9-inch baking pan. Sprinkle remaining crushed Butterfinger bars over top of batter. Bake for 30 to 35 minutes, or until done. Cool, then cut into bars.