Can't-Leave-Alone Bars

1 . Stage

Preheat the oven to 350 degrees F (175 degrees C).

2 . Stage

Mix together cake mix, oil, and eggs in a large bowl using a fork until just blended. Set aside.

3 . Stage

Combine condensed milk, chocolate chips, and butter in a saucepan over medium heat; cook and stir until melted and smooth, 2 to 4 minutes. Remove from heat.

4 . Stage

Press 1/2 of the cake mixture into a 9x13-inch dish; pour chocolate mixture over cake mixture. Take a small handful of remaining cake mixture and flatten between your hands; lay atop chocolate layer. Repeat with remaining cake mixture.

5 . Stage

Bake in the preheated oven until topping is lightly browned, about 20 minutes. Cool completely before cutting into bars.