This is the easiest recipe, but there are a few ideas to make it easier:
Ensure your butter gets down to room temperature before using; this will mean a quicker blend with the sugar. Butter that is too cold will not mix and warming it up in the microwave just makes it melt outside, while still leaving it stone cold inside.
Bake the muffins on the middle tray in the oven as this will allow a nice even bake between the top and bottom.
As most muffin trays have either 6 or 12 spots, you will be left with an odd three for the last round; fill up the center spots of the tray, for an even bake.
If you wish to add some chocolate chips, do so at the end, on top of each muffin, without putting them too deep into the mixture; while baking the batter will become more liquid before solidifying and the chips will go lower in the mixture by themselves.