Preheat the oven to 350 degrees and line the muffin cups with 12 cupcake liners.
Sift together the flour, cocoa, baking soda, and salt into a bowl, and set aside.
In a mixing bowl, beat together the sugar and eggs. Add the butter, milk, vanilla and sour cream. Then add the dry ingredients and stir until just combined. Stir in the chocolate chips.
Divide the batter between the muffin cups. Bake for 15 minutes.
Add the candy coated chocolates to the top of each muffin and bake five minutes more. They're done when they spring back when lightly touched.
Let them cool in the pan on a wire rack for five minutes, and then remove them from the pan to continue cooling. Serve warm or cooled.