What did God use to create Eve?

Answer: Adam's rib

God made a woman from the rib he had taken out of the man.

“So the LORD God caused the man to fall into a deep sleep, and while he slept, He took one of the man’s ribs and closed up the area with flesh. And from the rib that the LORD God had taken from the man, He made a woman and brought her to him.”— Genesis 2:21-22 (BSB)