Chicken with Mashed Potatoes and Gravy

Name: Chicken with Mashed Potatoes and Gravy
Prep time: 25 min
Cook time: 1 h 10 min
Total time: 1 h 10 min
Yield: 6 portions
Ingredients: 1 oz Parmesan cheese; &frac18; tsp black peppercorns; 3 oz panko bread crumbs; 1 tbsp dried parsley; 6 oz plain Greek yogurt; 1 oz tomato paste; 1 tsp paprika; 1 tbsp onion powder; 1 tbsp garlic powder; 1 tbsp dried parsley; 1 oz lemon juice; 1 oz extra virgin olive oil; 1 ½ tsp salt; 30 - 35 oz chicken breast fillets, boneless, skinless; 24 oz chicken stock; 24 oz russet potatoes; 1 - 2 oz unsalted butter; 2 oz whole milk; 1 oz unsalted butter; 1 oz all-purpose flour; 2 tsp soy sauce; salt; ground black pepper