Yulzzang Era Chicken Mushroom Sandwich

Cut chicken breast and button mushrooms into bite-sized pieces.

Thinly slice lettuce, tomato, and onion.

Heat olive oil in a pan and cook the chicken breast.

When the chicken is halfway cooked, add button mushrooms and sauté together.

Slice the bread in half and toast it lightly in a toaster.

Spread mustard sauce and mayonnaise on the bread.

Layer lettuce, chicken breast, mushrooms, tomato, and onion in order on the bread.

Close the sandwich and place it on a plate.