oooooops! I messed up on my recipe. Here is the correct way.

Peanut Butter Yummies
1 box yellow cake mix
1 stick of butter or margin
1 egg
1 can sweetened condensed milk
1 cup of creamy peanut butter
1 cup (8oz) semi sweet chocolate chips
Mix cake, butter, egg and peanut butter in bowl. Pour 2/3 of mixture into 9X13 baking pan. Melt chocolate chips with condensed milk (you can microwave then, use a boiler or what ever is best for you)When melted pour over cake mixture, then put the rest of cake mixture on top. (if you like you can pour 1/2 then of melted chips, then cake mixture then the rest of the melted chips) Put in pre heated oven of 350 degrees and cook 20-30 minutes. Let cool before you cut into squares.