Chicken and leek casserole with dumplings recipe

Ingredients

• 2 tablespoons olive oil
• 8 chicken thigh fillets, halved
• 1/3 cup seasoned plain flour
• 2 leeks, trimmed, sliced
• 100 grams speck, chopped
• 200 grams button mushrooms, halved
• 1 clove garlic, crushed
• 1/2 cup white wine
• 3 cups chicken stock
• 1 bunch dutch carrots, trimmed, halved
• 1 sprig rosemary, plus extra leaves
• Dumplings
• 2 (300g) floury potatoes, peeled, chopped
• 1 1/2 cup self-raising flour
• 100 grams butter, chilled, chopped
• 1/2 cup milk, plus extra, for brushing