1 (18 1/2 oz.) pkg. yellow cake mix
1/2 c. melted butter
4 eggs, divided
1/2 c. firmly packed brown sugar
1 1/2 c. dark corn syrup
1 tsp. vanilla extract
1 c. chopped pecans

Set aside 2/3 cup cake mix. Combine remaining cake mix, butter, and 1 egg in a large mixing bowl; mix with a fork until crumbly. Press crumbs in a greased 13x9x2 inch baking dish. Bake at 350 degrees for 15 to 20 minutes or until light golden brown.

Combine reserved cake mix, 3 eggs, brown sugar, corn syrup and vanilla in a mixing bowl; beat at medium speed of electric mixer 1 to 2 minutes. Pour over partially baked crust and sprinkle with pecans. Bake at 350 degrees for 30 to 35 minutes. Cool and cut into bars.