minecraft-assets/data/minecraft/recipes/potato_eye.json

{
  "type": "minecraft:crafting_shapeless",
  "category": "misc",
  "ingredients": [
    {
      "item": "minecraft:poisonous_potato"
    }
  ],
  "result": {
    "count": 2,
    "id": "minecraft:potato_eye"
  }
}