Preheat oven to 350 degrees. Grease 8x8 pan.
Cream butter and sugar.
Add flour; beat until well blended.
Press into bottom of 8x8 pan.
Bake 10 minutes.
While crust is baking, beat eggs in a large bowl and add brown sugar, melted butter, corn syrup and vanilla.
Blend in pecan and pour mixture over hot crust.
Bake for 20-25 minutes or until set. Cool and cut into bars