Grease a dish or pan with butter and set aside.

Bring butter, milk, cocoa, and sugar to a boil.

Remove from heat and add in oats stirring well.  

Quickly stir in the peanut butter and mix until well combined. 

Pour into a cookie sheet or casserole dish (8x8) and spread evenly around. 

For chocolate icing (optional):  melt down chocolate chips in the microwave (chocolate chips plus 1T milk), spoon into a ziplock bag and cut of the tip.  Pipe the design over the bars.  You could also just spoon it over the mixture before putting it in the fridge to create a hard iced topping. 

Set in the fridge to harden for at least 4 hours.  

Cut into bars or enjoy from the pan like we used to do! shhhhh don't tell