Preheat oven to 350 degrees. Spray 15x10 pan with Pam.
Cookie Crust: In large bowl at medium speed beat: 2 1/2 C. flour 2 sticks of margarine, cut in pieces 1/2 C. sugar 1/2 tsp. salt Beat until mixture resembles fine crumbs.Press firmly into pan.Bake 20-30 minutes or until golden brown.Mix filling and put on crust and finish baking.
Filling: 4 eggs 1 1/2 C. Karo light or dark syrup( I use light) 1 1/2 C. sugar 3 Tbsp. butter or margarine, melted 1 1/2 tsp. vanilla 2 1 /2 C. pecans, chopped
Beat eggs, corn syrup, sugar, butter and vanilla until well blended.Stir in pecans.Pour over hot crust and spread evenly.Bake 25 minutes or until filling is firm around the edges and slightly firm in the center. Cool completely.Makes 48.