Preheat oven to 350 degrees F. and place cookie dough into a large bowl breaking up with a spoon. Add cocoa powder, flour and heavy cream, stirring to combine.
Scoop a heaping tablespoon of dough into your hands and place a peppermint patty on top. Scoop another tablespoon of dough on top of peppermint patty. Form dough around peppermint patty so that dough is completely covering the chocolate. Place onto a baking sheet and bake for 13-15 minutes, or until baked through. Remove and let cool completely.
When cooled, spread a thin layer of frosting over tops of cookies then sprinkle with crushed peppermint candies.