Preheat oven to 350 degrees Fahrenheit.  Prepare a 9x13 pan by lining with parchment paper or lightly spraying with cooking spray.  Cream together butter, brown sugar, pudding packet, eggs, and vanilla until mixture turns light in color.  In a separate bowl, stir together flour, baking cocoa, baking soda, and salt.  Add flour mixture to wet mixture and mix until combined.

Press mixture into prepared pan, press candies on top (I cut my mini Reese's pb cups into fourths). Bake for 14-15 minutes. Don't overbake or they'll loose their perfect fudge texture! Let cool, then slice into squares and serve.