1 stick (or 1/2 c.) butter
1/2 c. milk
2 c. sugar
1/2 c. baking cocoa

Remove from heat, then add:

1/2 c. peanut butter
1 tsp. vanilla
3 c. quick oats

Spread mixture into a 9x9 inch square pan. Allow to cool for several hours. (Refrigeration is O.K.) Cut into bars and serve.