1 white cake mix
1/3 c. oil
2 eggs
1/4 c. butter
1 can sweetened condensed milk
1 c. chocolate chips

Mix with fork the cake mix, oil and eggs. Pat 2/3 of mixture into a greased 9 x 13 inch cake pan. Melt on the stove butter, sweetened condensed milk and chocolate chips. Pour this over cake mixture. Then put remaining cake mixture in spoonfuls here and there and swirl with a knife. Bake for 20 minutes at 350 degrees. Cool and cut bars.