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

{
  "type": "crafting_shapeless",
  "ingredients": [
    {
      "item": "minecraft:pumpkin"
    },
    {
      "item": "minecraft:sugar"
    },
    {
      "item": "minecraft:egg"
    }
  ],
  "result": {
    "item": "minecraft:pumpkin_pie"
  }
}