1/2 cup butter
1/2 cup margarine
1 cup packed light brown sugar
1 cup chopped pecans
1 teaspoon vanilla extract
Preheat oven to 350° F.
Line cookie sheet with foil and cover bottom of pan with graham crackers.
Bring butter, margarine, and sugar to a boil for 2 minutes. Add pecans and vanilla.
Pour over crackers; spread evenly.
Bake for 10 minutes. Cut while warm or break into small pieces.