These cream cheese filled chocolate muffins are life changing, and no, no, don't try to disagree with me until you try them. Because they really will change your life, for the better. :p
These are the kind of muffins that you keep a stash for when you just can't do life anymore and need to have something chocolatey and indulgey (not a word, I know) and need it asap.
In a separate bowl, whisk together the eggs with the buttermilk, oil, melted butter, and vanilla extract. Pour this mixture into the dry ingredients and mix until just combined.