Heat your oven to 350°F (175°C) before using it. Put oil or butter on a baking pan that measures 9 by 13 inches.
In a big bowl, mix together the cake mix, melted butter, and one egg. Mix until the dough is soft.
Spread the dough evenly on the bottom of the greased baking pan. Cook in the oven for 10 minutes.
While the bottom part is cooking, mix the other 2 eggs, corn syrup, brown sugar, and vanilla extract in a bowl until the mixture is smooth. Add the chopped pecans and mix.
Pour the mixture of pecans over the crust that has been partially baked and spread it out evenly.
Bake for another 25-30 minutes until the filling is firm and golden brown.
Allow the bars to cool down completely in the pan before cutting them into squares.
Time to prepare: 10 minutes | Cooking time: 35 minutes | Total time: 45 minutes
Calories: 280 calories | Portions: 16 bars