Can't Leave Alone Bars

I got this recipe in an email and thought it was well worth sharing. Seems simple enough to make and sounds delicious too. Something we would love to make for the holidays coming up.

1 pkg. (18-1/4oz.) white cake mix
2 eggs
1/3 cup vegetable oil
1 can (14-oz.) sweetened condensed milk
1 cup semisweet chocolate chips
1/4 cup butter or margarine, cubed
In a bowl, combine the dry cake mix, eggs and oil. With floured hands, press 2/3 of the mixture into a greased 13x9x2-inch baking pan. Set remaining cake mixture aside.
In a microwave-safe bowl, combine the milk, chocolate chips and butter. Microwave, uncovered, on HIGH for 45 seconds; stir. Microwave 45-60 seconds longer or until chips and butter are melted; stir until smooth. Pour over crust.
Drop teaspoonfuls of remaining cake mixture over top. Bake at 350 for 20-25 minutes or until lightly browned. Cool before cutting.
YIELD: 3 dozen bars.