Who created the baking sheet?

The baking sheet is very likely the most ancient metal cooking tool known to man.

Before routine use of metals, large tough leaves or hollow gourds, frequently soaked in water, were used to protect foods from direct heat when cooking on a fire.

Once the metal baking sheet in its many forms became possible it was the forerunner of practically every other cooking container, from pans to pots and grills (broilers) and beyond.

There is no possible way to pin down the first use, or the creator of, the metal baking sheet since it came into use in many places and by many people before recorded history.