Preheat oven 350F. Coat 13 x 9 x 2-inch baking pan with nonstick cooking spray.
In mixing bowl, combine cake mix, melted butter and 1 egg, mixing until stiff dough forms. Press mixture evenly in bottom of prepared pan. Bake crust 15 minutes or until light brown.
In mixing bowl, combine remaining 2 eggs, corn syrup, brown sugar, egg white, and vanilla, mixing well. Stir in pecans. Pour evenly over baked crust and return to oven 20 minutes or until filling is set.