[header] How to make a single serving cookie [title] Melt your butter a little bit. [step] First, preheat your oven to 350 degrees fahrenheit (177 degrees celsius). While that heats up, let your butter soften to room temperature, or dish 2 tablespoons into a bowl or cup that's safe to microwave. 
Nuke it for ten-second bursts and check in between to see how much it has melted. Quit once it has mostly melted, but still retains some of its original shape.