Yucca Gnocchi with Parsley Cream Sauce

• 1 lb yucca

• 6 garlic cloves

• Salt and pepper

• 1 egg

• ¾ cup all-purpose flour

• ¼ teaspoon grated nutmeg

• 1 cup heavy cream

• ½ cup butter

• 1 cup parsley leaves, processed in the blender with ¼ cup water

• 4 oz Parmesan cheese, grated