Ingredients

1 (18.25 ounce) package white cake mix

1/2 cup vegetable oil

2 eggs

1 (14 ounce) can sweetened condensed milk

1 cup milk chocolate chips

1/2 cup butter

Directions

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

Mix cake mix, vegetable oil, and eggs together in a bowl using a fork until just blended. Divide mixture in half.

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

Press half the cake mixture into a 9×13-inch pan; 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.

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

source:allrecipes.com