Preheat the oven to 320 degrees Fahrenheit and boil a kettle of water.
Step 2
Lightly butter 2 large ramekins. Heat the remaining butter in a saucepan over a low/medium heat. Finely slice the mushrooms and add to the pan. Sauté in the butter for 3-4 minutes until tender.
Step 3
Divide the mushrooms between the two ramekins.
Step 4
Crack one egg on top of each and season with salt and pepper.
Step 5
Finely chop the chives and sprinkle over the eggs, along with the grated cheese.
Step 6
Spoon the crème fraiche over the top of the cheese.
Step 7
Arrange the ramekins in a deep baking tray and half fill the baking tray with the boiling water.
Step 8
Transfer to the oven to bake for 15-20 minutes or until the eggs are cooked to your preferred taste.