Shred lettuce and spinach.

Slice radish and celery.

Cube cooked chicken.

Shred cheddar cheese.

In a salad bowl, layer half of the shredded lettuce, half of the shredded spinach, sliced radishes, cubed chicken, and diagonally cut celery.

Add the remaining shredded lettuce, remaining shredded spinach, and shredded cheddar cheese.

In a separate bowl, combine mayonnaise, Worcestershire sauce, and dry mustard.

Spread the mayonnaise mixture evenly over the top of the salad.

Cover the salad bowl tightly with plastic wrap or a lid.

Chill the salad in the refrigerator for several hours or overnight.

Garnish with sliced green onions before serving.

Toss the salad gently just before serving to distribute the dressing.