tastytoasters/src/main/resources/data/tastytoasters/recipes/toaster.json

{
  "type": "minecraft:crafting_shaped",
  "pattern": [
    "A A",
    "B B",
    "AAA"
  ],
  "key": {
    "A": {
      "item": "minecraft:iron_ingot"
    },
    "B": {
      "item": "minecraft:blaze_rod"
    }
  },
  "result": {
    "item": "tastytoasters:toaster",
    "count": 1
  }
}