This is a recipe for yummy, moist and bouncy muffins if you need a great recipe for muffins where you can add anything to it like coca powder, dried fruit etc.. this is one that will work no doubt even in a terrible 1 temperature oven where all the heat escapes. I've made muffins with this recipe many times now and they come out beautifully, especially in silicone muffin cases. When adding chocolate i recommend not using milk chocolate if you don't like it really sweet like me because it's too sickly, use dark chocolate instead, if you make a ganache to pipe on top like i've done (see in photos), then i reccomend using dark chocolate for that too.
This recipe makes 12 muffins exactly, you will be able to get another 2 muffins out of this recipes if just using chocoolate chips. When mixing it doesn't matter if there is any butter lumps because it's not meant to be mixed for a long time. When cooling the butter down to room temperature a quick way to cool it without effecting it is by putting some cold water in your sink and place the bowl into it, it should cool down within 10 - 15 mins.