ActuallyAdditions/src/generated/resources/data/actuallyadditions/recipes/black_quartz_slab.json

{
  "type": "minecraft:crafting_shaped",
  "pattern": [
    "QQQ"
  ],
  "key": {
    "Q": {
      "item": "actuallyadditions:black_quartz_pillar_block"
    }
  },
  "result": {
    "item": "actuallyadditions:black_quartz_slab"
  }
}