Place chicken, garlic, parsley, red pepper flake, salt and pepper into a medium mixing bowl.
Gently combine the ingredients and form into 4 equally-sized patties. If the mixture is too wet and does not make patties easily, add bread crumbs a little at a time and mix.
If you have the time, place the patties onto wax paper, cover and refrigerate overnight. This helps the flavors blend better and the patties to firm up, especially if you've added bread crumbs.
If you are cooking in a skillet, heat oil in a large skillet and add the burgers. Cook 5-6 minutes per side until golden brown.
If you are cooking on a griddle, add some oil to hot griddle over medium heat. Cook the patties 5-6 minutes, flipping once, until golden brown.
Right before you remove the patties top them with the cheese, pepperoni and sauce and let heat for another minute.
Transfer patties to burger buns and serve.