Combine flour with 3 tablespoons brown sugar; cut in 1/2 cup butter until coarse crumbs form. Press into a lightly greased 11"x7" baking pan. Bake at 375° for 20 minutes.

While crust is baking, beat eggs in a large bowl and add remaining brown sugar, 2 tablespoons melted butter, corn syrup and vanilla. Blend in pecans and pour mixture into hot crust. Bake for 15 to 20 minutes. Cool and cut into bars.