Preheat the oven to 300 degrees F.
Slice off the tops of the peppers. Wash the peppers and remove the cores and seeds. Stand the pepper cups upright in a saucepan containing 1/2 cup boiling water. Cover tightly and allow steam 5 minutes. Remove and drain.
In a large bowl, mix together the rice, cheese parsley, salt, and ground pepper. Divide the mixture and stuff each pepper.
Stand the peppers in a loaf pan or cupcake tins. Bake for about 15 minutes, until the filling is hot and the cheese melts.