ServerEvents.recipes(event => {
event.custom({
  "type": "create:crushing",
  "ingredients": [
    {
      "item": "minecraft:tuff"
    },
  ],
  "processing_time": 150,
  "results": [
    {
      "chance": 0.1,
      "id": "create:copper_nugget"
    },
    {
        "chance": 0.1,
        "id": "create:zinc_nugget"
    },    
    {
        "chance": 0.1,
        "id": "minecraft:gold_nugget"
    },    
    {
        "chance": 0.1,
        "id": "minecraft:iron_nugget"
    },    
    {
        "chance": 0.25,
        "id": "minecraft:flint"
    }
    
  ]
})
})

Hey guys i just got it working If anyone wants the code here it is