minecraft-assets/data/minecraft/advancement/recipes/misc/creeper_banner_pattern.json

{
  "parent": "minecraft:recipes/root",
  "criteria": {
    "has_creeper_head": {
      "conditions": {
        "items": [
          {
            "items": "minecraft:creeper_head"
          }
        ]
      },
      "trigger": "minecraft:inventory_changed"
    },
    "has_the_recipe": {
      "conditions": {
        "recipe": "minecraft:creeper_banner_pattern"
      },
      "trigger": "minecraft:recipe_unlocked"
    }
  },
  "requirements": [
    [
      "has_the_recipe",
      "has_creeper_head"
    ]
  ],
  "rewards": {
    "recipes": [
      "minecraft:creeper_banner_pattern"
    ]
  }
}