Name: Chicken Mushroom Pie with Duchess Potato Lid Recipe
Prep time: 20 min
Cook time: 50 min
Total time: 1 h 10 min
Cuisine: British / Irish
Ingredients: 60 g / (4 tbsp) unsalted butter (approximately divided into 4 portions); 4 garlic cloves, finely minced; 1 1/2 tsp cooking salt / kosher salt (divided); 1 tsp black pepper (divided); 750 g / 1.5 lb chicken thighs, boneless skinless; 500 g / 1 lb button mushrooms (small whole, larger ones halved or quartered); 100 g / 3.5 oz thick cut streaky bacon, cut into 2.5 cm / 1″ squares; 1 1/2 onions, cut into 2 cm / 1″ squares or thick wedges; 2 sprigs fresh thyme or 1/2 tsp dried thyme; 1/4 cup plain flour (all-purpose flour); 3/4 cup Guinness beer; 1 1/2 cups beef stock / broth, low sodium; 3/4 cup water; 1 tbsp tomato paste; 1 kg / 2 lb starchy potatoes, peeled, cut into 2.5 cm / 1″ cubes; 30 g / 2 tbsp unsalted butter, cut into 1.5 cm / 1/2″ pieces; 1/3 cup hot milk; 1/8 tsp white pepper (black pepper can be substituted); 1/2 tsp salt; 30 g / 2 tbsp unsalted butter, melted (or olive oil spray); 2 tbsp grated Parmesan (sandy store-bought type or freshly grated works best); 2 tsp finely chopped parsley for garnish (optional)

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Introduction

This Chicken Mushroom Pie with a Duchess Potato lid is a comforting and rich dish perfect for chilly evenings. Tender chicken thighs and earthy mushrooms simmered in a Guinness-infused gravy are topped with creamy, piped mashed potatoes for an impressive yet homey meal.

Chicken Mushroom Pie with Duchess Potato Lid Recipe - Recipe Image

Ingredients

60 g (4 tbsp) unsalted butter, approximately divided into 4
4 garlic cloves, finely minced
1 1/2 tsp cooking salt / kosher salt, divided
1 tsp black pepper, divided
750 g (1.5 lb) boneless skinless chicken thighs
500 g (1 lb) button mushrooms, very small ones whole, larger ones halved or quartered
100 g (3.5 oz) thick cut streaky bacon, cut into 2.5 cm (1″) squares
1 1/2 onions, cut into 2 cm (1″) squares or thick wedges
2 sprigs fresh thyme or 1/2 tsp dried thyme
1/4 cup plain flour (all-purpose flour)
3/4 cup Guinness beer
1 1/2 cups beef stock or broth, low sodium
3/4 cup water
1 tbsp tomato paste
1 kg (2 lb) starchy potatoes, peeled and cut into 2.5 cm (1″) cubes
30 g (2 tbsp) unsalted butter, cut into 1.5 cm (1/2″) pieces
1/3 cup hot milk
1/8 tsp white pepper (black pepper can be substituted)
30 g (2 tbsp) unsalted butter, melted (or olive oil spray)
2 tbsp grated Parmesan cheese
2 tsp finely chopped parsley for garnish (optional)

Instructions

Step 1: Melt one-quarter of the butter in a large 30 cm (12″) non-stick pan over high heat. Add the mushrooms and toss for 3 to 4 minutes until browned on the surface. Add another quarter of the butter, toss to coat, then season with 1/4 tsp salt, 1/4 tsp pepper, and half the garlic. Toss for 30 seconds until garlic is golden. Remove mushrooms to a bowl, scraping out all garlic bits.
Step 2: Sprinkle chicken thighs with 1/2 tsp salt and 1/4 tsp pepper. In the same pan, melt another quarter of the butter until hot and foamy. Sear chicken for 2 minutes on each side until golden but still raw inside. If needed, cook in batches. Remove chicken to a plate, let cool slightly, then cut into 2.5 cm (1″) pieces.
Step 3: Add bacon to the pan and stir for 15 seconds, then add onions. Cook for 2 minutes until onion edges are golden and softening. Add remaining garlic and stir for 20 seconds.
Step 4: Pour in the Guinness beer and simmer rapidly, scraping the pan’s base to loosen browned bits (“fond”). Reduce the Guinness by about 75%.
Step 5: Lower heat to medium and add remaining butter. Once melted, sprinkle flour evenly over the surface and stir for 1 minute until pasty. Pour in half the beef stock while stirring to dissolve flour without lumps. Add remaining stock, water, tomato paste, 1/4 tsp salt, and 1/2 tsp pepper. Stir thoroughly.
Step 6: Return mushrooms and their juices to the pan. Simmer for 10 minutes until the gravy thickens and mushrooms soften. While simmering, prepare the mashed potatoes.
Step 7: Add chicken and its juices back into the pan. Simmer an additional 2 to 3 minutes until the gravy is thick enough to leave a trail when the pan is dragged. Taste and adjust salt if necessary.
Step 8: Pour the mixture into a 1.5 to 2 L (6 to 8 cup) baking dish and smooth the surface. Preheat the oven to 200°C (390°F) or 180°C fan-forced.
Step 9: For the mashed potato topping, boil potatoes in cold water until tender, about 15 minutes. Drain and mash or use a potato ricer. Stir in butter, hot milk, 1/2 tsp salt, and white pepper until creamy but firm enough to hold shape.
Step 10: Transfer the mash to a piping bag fitted with a star tip. Pipe mounds or swirls covering the surface of the pie. Drizzle with melted butter and sprinkle Parmesan over the top.
Step 11: Bake the pie for 30 minutes, rotating the pan halfway through. Let rest for 10 minutes before serving. Garnish with parsley if desired.

Tips & Variations

Use small button mushrooms whole for best texture; larger mushrooms can be quartered to match cooking times.
If you don’t have a piping bag, spread the mashed potato evenly with a spoon and sprinkle with Parmesan for a rustic look.
Substitute the Guinness with a dark ale or stout if unavailable, or use extra beef stock for a milder flavor.
For a vegetarian version, replace chicken with hearty vegetables like roasted squash or lentils, skip the bacon, and use vegetable stock.
To intensify the flavor, add a splash of Worcestershire sauce or a teaspoon of smoked paprika to the gravy.

Storage

Store any leftover pie covered in the refrigerator for up to 3 days. Reheat in the oven at 180°C (350°F) until warmed through, about 15–20 minutes, to maintain crispness on the potato topping. Avoid microwaving to preserve texture.

How to Serve

Serve this delicious recipe with your favorite sides.

FAQs

Can I make this pie in advance?

Yes, you can prepare the filling and mashed potatoes separately and assemble just before baking. This makes for an easy dinner after a busy day.

What can I use instead of Guinness beer?

If you don’t have Guinness, substitute with another stout or dark ale, which will provide a similar depth of flavor. For a non-alcoholic option, use extra beef stock with a teaspoon of molasses or balsamic vinegar for richness.