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

Mix first three ingredients together with a fork, and pat 1/2 into bottom of an ungreased 9 x 13 pan. Melt remaining ingredients on stove, and pour over cake mixture; then put remaining cake mixture on top. Swirl with knife. Bake at 350 degrees for 20 minutes.

Makes 28 to 32 bars.