Rachael Ray's 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
• 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