Steakhouse Shepherds Pie

Name: Steakhouse Shepherd's Pie
Ingredients: 2 pounds Idaho potatoes, peeled and cut into chunks; Salt; 1/2 tablespoons extra-virgin olive oil; 4 slices good quality bacon or peppered bacon, chopped; 2 pounds ground sirloin; 1 onion, chopped; 1/2 pound button mushrooms, quartered; Black pepper; 2 tablespoons butter; 2 tablespoons all-purpose flour; 1 1/2 cups beef stock; 2 tablespoons Worcestershire sauce; 1 egg yolk; 3 tablespoons sour cream; 1/2 pound blue cheese, crumbled (recommended: Maytag); 3 to 4 tablespoons chives; 1 teaspoon paprika