Heat a frypan over medium heat, then add 1-2 tbsp of salted butter and let it melt. Once melted, add mushrooms and saute until browned and all the juices evaporate. This may take 5 minutes or more. Season with salt and pepper to taste.

Add cooking cream and combine well. Let the cream reduce slightly. Turn off heat once done.

Meanwhile, spread a generous amount of butter onto both sides of all 4 slices of bread.

Heat a bigger frypan (big enough to fit 2 slices of bread at once) over medium heat. Place two slices of bread into frypan and fry till brown and crispy. This will take around 1-2 minutes. Remove both slices and add more butter into the pan.

Place one slice of bread back into pan, with the uncooked side down. Add cheese onto bread, then add sauteed mushrooms, and finally some more cheese. Place another slice of bread, cooked side down, onto the sandwich and press down firmly to ensure the sandwich is even.

Once the bottom of the sandwich is deep brown and crispy, carefully flip the sandwich to cook the other side. You may want to add more butter to the pan to get better browning. Once the sandwich is brown and crispy on both sides, remove from pan and slice into half.

Repeat for the other slices of bread.