My brother Lee is the best No-Bake cookie maker I know. I swear he had the recipe memorized.
From what I can tell, there are several different ways to make it. This is how we do it.
1/2 cup butter
2 cups sugar
1/2 cup milk
4 tbsp cocoa
1/2 cup peanut butter
3 cups Oats
2 tsp vanilla extract
1 tsp salt (only if you use unsalted butter)
Pour everything into a large saucepan and mix over medium heat. It will start boiling but that is what you want it to do.
Once the mixture is very thick and not running scoop out spoonfuls to place on wax paper and let cool. If you are uncertain about the readiness, let boil for a little longer. Make sure it's thick. Just don't undercook it. It will stay soft and runny.
Cooling times differ. It depends on how long you let the mixture cook.
And once again the Internet isn't connecting. I'll try again in the morning to add a song.