Wash your mushrooms by rubbing a damp towel over the tops to remove any dirt. Slice the mushrooms.

Cook the mushrooms in the olive oil in a single layer until browned on one side. Turn them over and cook until browned on the other side. Season with salt and pepper.

While the mushrooms are cooking, toast your bread.

After your bread has toasted, spread a thin layer of Marmite on each slice. Next spread on a fairly thick layer of mashed avocado.

Top the toast with the sautéed mushrooms and season with chili flakes, black pepper and more salt if desire. Just remember Marmite is really salty!