Easy CraftTweaker

This addon allows to create or remove different recipes inside without any code by placing items as they should be in the craft and then pressing Copy recipe or Add recipe straight to the Craft Tweaker and then pressing Reload recipes.  

Take item "Recipe Manager" from "Easy Tweaker" tab and use it to open GUI.

Here is example of using Workbench gui for adding a shaped recipe for amethyst sword:

Here is an example of craft in Blast furnace with wanted quantity.

You can even use potions and remove/add their recipes.