In the video, a person is seen preparing a sandwich on a piece of parchment paper. The person starts by spreading mayonnaise on a slice of bread with a spoon. Then, they add a slice of cheese on top of the mayonnaise. Next, they place a slice of avocado on the cheese. After that, they add a slice of tomato on top of the avocado. Finally, they place another slice of bread on top to complete the sandwich. The sandwich is then cut in half with a knife.