Pecan Pie Bars with Cake Mix

Ingredients (9)

• 1 package yellow cake mix (regular size)
• 1/4 cup butter, softened
• 1 large egg, room temperature
• FILLING:
• 1-1/2 cups corn syrup
• 1/2 cup packed brown sugar
• 1 teaspoon vanilla extract
• 3 large eggs, room temperature
• 1 cup chopped pecans