In a bowl, stir together the flour, cocoa powder, baking soda and salt.

In a mixing bowl, beat the butter until creamy, then beat in granulated sugar and brown sugar. Beat in the egg and vanilla.

Stir the dry ingredients into the butter mixture until incorporated, then stir in the peanut butter chips and candy.

Using a heaping tablespoon, scoop up 12 mounds of dough and arrange on a foil lined plate. Chill dough for about an hour or until ready to bake.

To bake the cookies, preheat oven to 350 degrees F. Arrange dough balls on a parchment lined baking sheet and bake for 12 to 15 minutes or until cookies appear set. Let cool on the baking sheet for about 4 minutes, then transfer to a wire rack and let cool completely.