Preheat oven to 350°.
Line or grease muffin tins.
Cream together butter and sugars until light and fluffy.
Mix in one egg at a time, along with the vanilla, salt, baking soda, and baking powder.
Sift cocoa powder into the bowl, mixing well until fully incorporated.
Alternate additions of flour and sour cream until fully combined.
Fold in chocolate chips.
Scoop into muffin tins.
Bake 18-20 minutes.
Cool in pan for 5 minutes.
Enjoy!