The phrase "sliced mushrooms" refers to a type of cooked and prepared mushroom that has been cut into thin, even slices. This can be done using a knife or with the help of specialized kitchen gadgets such as a mandoline slicer. Sliced mushrooms are often used in various dishes for their flavorful and meaty texture, adding an extra layer of taste to salads, pastas, sandwiches, and many other culinary creations.