30 Minute Shepherds Pie

Name: 30 Minute Shepherd's Pie
Ingredients: 2 pounds potatoes, such as russet, peeled and cubed; 2 tablespoons sour cream or softened cream cheese; 1 large egg yolk; 1/2 cup cream, for a lighter version substitute vegetable or chicken broth; Salt and freshly ground black pepper; 1 tablespoon extra-virgin olive oil, 1 turn of the pan; 1 3/4 pounds ground beef or ground lamb; 1 carrot, peeled and chopped; 1 onion, chopped; 2 tablespoons butter; 2 tablespoons all-purpose flour; 1 cup beef stock or broth; 2 teaspoons Worcestershire, eyeball it; 1/2 cup frozen peas, a couple of handfuls; 1 teaspoon sweet paprika; 2 tablespoons chopped fresh parsley leaves