How do get a specific item in a list?

Hi. I have a list of buttons and i want to get the one i clicked.

 [System.Serializable]
 public class Item
 {
     public string name;
     public Sprite icon;
     public int cps;
     public int cost;
     public Button.ButtonClickedEvent OnClickShopButton;

     public bool bought = false;
 }

public class CreateScrollList : MonoBehaviour {

 public GameObject sampleButton;
 public List<Item> itemList;

 public Transform contentPanel;

 void Start () {
     PopulateList();
 }
 
 void PopulateList() {
     foreach (var item in itemList)
     {
         GameObject newButton = Instantiate(sampleButton) as GameObject;
         SampleButton button = newButton.GetComponent<SampleButton>();
         button.nameLabel.text = item.name;
         button.iconImage.sprite = item.icon;
         button.CPS.text = "CPS: " + item.cps;
         button.Cost.text = "Cost: " + item.cost;
         button.button.onClick = item.OnClickShopButton;
         newButton.transform.SetParent(contentPanel);
     }
 }
  public void OnClickShopButton()
 {
     Item item = // What should i type here to get the item i clicked
     if(CakeManager.cakes >= item.cost){
         item.bought = true; 
     }

     }
 }