pecan pie bar's

Ingredients

• 1 box yellow cake mix save 2/3 c for later
• 1 stick butter, softened
• 1 - egg
• 3 - egg
• 1 teaspoon vanilla extract
• 1 1/2 cups karo
• 1/2 cup brown sugar, firmly packed
• 1 cup pecans
• 2/3 cup remaining cake mix