Peanut Butter Chocolate Bars

I found this recipe at The Girl Who Ate Everything and decided to try it out today. These things are RICH, but they are pretty good if you are hungry for peanut butter and chocolate. :)

Combine:

1 pkg. plain yellow cake mix
1 stick melted butter
1 c. creamy peanut butter
2 eggs
     
Press this into a 9X13 pan reserving 1 1/2 c. of the mixture to crumble on top.
            


Melt:
1 (12 oz) pkg. chocolate chips
1 can sweetened condensed milk
2 T. butter
  
Melt on low heat in a small pot. Remove from heat and add:
 
2 tsp. vanilla

Spread chocolate mixture over the mixture pressed in the pan and then crumble the 1 1/2 of reserved cake mixture on top. Bake for 20-25 minutes at 325 degrees. Cool completely before cutting into bars.