Preheat oven to 375º. Grease muffin tins well.
Melt the butter in the microwave in a large, microwave safe bowl. Add the sugar and microwave until the sugar is dissolved, but not bubbling.
Whisk in the cocoa powder, vanilla, and eggs.
Mix together the salt, baking powder and flour. Add the the rest and stir well.
Fold in the chips and Oreos.
Fill muffin tins 3/4 full. Bake for about 17 minutes. Run a knife around each one when you get them out. Let them cool before you remove them.