1) Preheat the oven by setting it to the desired temperature.
2) Bake the patty shells by placing it in the pre-heated oven according to the instructions given on the package.
3) Take a large skillet and melt butter in it.
4) Add cheese, garlic powder, sour cream and sherry to it and cook over low heat until the mixture becomes hot.
5) Take a spoon and scoop the mixture into the cooked patty shells.
6) Garnish with parsley and serve immediately.