Slice the king oyster mushrooms into thick pieces and cut each into thirds.

Create a hole in the center of each mushroom slice and finely chop the leftover mushroom pieces.

Mash the spam in a bag until smooth.

Mix the mashed spam with chopped green onion, red chili, carrot, chopped mushroom, and black pepper.

Stuff the mushroom holes with the spam mixture, pressing firmly.

Coat each stuffed mushroom slice in flour, then dip in beaten egg.