This setting can be used to change the title of the cooking UI like highlighted in the image below.
Go to the BP_CookingComponent and create a new variable called CookingUITitle and set its type to Text and set its default value to COOKING and tick Instance Editable. Then compile.
Then go to the location shown below and add the highlighted nodes, location at top of image.
You can now change the title text by changing the CookingUITitle in the cooking component.