Chicken and Mushroom Casserole in the Oven
Juicy, made from simple ingredients, perfect for a family dinner! Chicken and Mushroom Casserole in the oven features tender mashed potatoes with a juicy filling under a delicious sour cream and cheese topping. Simple, affordable, easy to prepare, and convenient to serve.
Updated : 20 August, 2025
Easy
About 45 min.
Ingredients
650 grams
Potato
250 grams
Chicken fillet
200 grams
Champignon
1
Onions
2 tablespoon
Vegetable oil
20 grams
Butter
100 milliliters
Milk
2
Eggs
120 grams
Sour cream
90 grams
Hard cheese
to taste
Salt
to taste
Herb mix
Table
Table of volume measurements:
- teaspoon - 5 ml
- dessert spoon - 10 ml
- tablespoon - 20 ml
- glass - 200 ml
Preparation
Step 1
If using wild mushrooms, rinse them carefully and boil beforehand. Any fat content sour cream can be used.
Step 2
Peel potatoes and cut into medium pieces. Cover with water, bring to a boil, salt, and cook over medium heat until tender. Potatoes should be soft and easily pierced with a knife.
Step 3
Wash and peel the onion, cut into small cubes.
Step 4
Washed and cleaned champignons should be placed on a kitchen towel to absorb excess moisture. Leave for 15-20 minutes. Drying the mushrooms is important; otherwise, they become watery. Cut into cubes.
Step 5
Drain water from boiled potatoes. Mash hot potatoes with butter. Gradually pour in warm milk and mash to a smooth consistency.
Step 6
Let the mashed potatoes cool. They should not be hot, or the egg will curdle. Add an egg and mix thoroughly to evenly incorporate.
Step 7
Wash chicken fillet, pat dry, and cut into small cubes. You can use thigh or drumstick meat, deboned.
Step 8
Heat vegetable oil in a skillet. Fry the onions, stirring occasionally until nearly soft.
Step 9
Add chicken to the skillet and cook until done, stirring occasionally. Season with salt, Provencal herbs, or any spices to taste.
Step 10
Separately, fry mushrooms in vegetable oil, lightly salt, and cook until moisture evaporates.
Step 11
Combine the fried chicken and mushrooms and mix well.
Step 12
Grease a baking dish with butter. Spread half of the mashed potatoes evenly.
Step 13
Spread the chicken and mushroom filling evenly over the potato layer.
Step 14
Cover the filling with the remaining mashed potatoes and smooth the surface.
Step 15
Grate cheese on a coarse or fine grater. Any cheese is fine: hard, processed, mozzarella – your choice. Cheese gives the main flavor to the topping.
Step 16
In a bowl of suitable size, beat the egg with sour cream until smooth.
Step 17
Add the cheese to the mixture and mix thoroughly.
Step 18
Pour the topping over the potato layer and smooth evenly.
Step 19
Place the casserole in a preheated oven at 356°F (180°C) for 25-30 minutes. Cooking time may vary depending on your oven.
Step 20
Serve the chicken and mushroom casserole warm. Enjoy!