01 -
If you want to use your microwave, put cocoa, sugar, and water in a cup and nuke for 15 seconds. Drop in the peanut butter, stir it up, then add your milk. Heat for about 1 to 1.5 minutes until it's hot, stirring as you go.
02 -
To throw together some peanut butter sauce, mix 2 tablespoons of corn syrup and 1 tablespoon of peanut butter in a microwavable bowl. Microwave 10-20 seconds till it bubbles up, then stir till it's silky.