If you have a sealed class and would like to standardize or automate setup, one of the solutions is to create a class with an operator overload.

Standardizing Setup on a Sealed Class

public class DefaultController : Controller
{
    public ActionResult Index()
    {
        Response.Cookies.Add(new AccountIdCookie(12345));
        return View();
    }
}

class AccountIdCookie
{
    const string Name = "acct_id";
    int _accountId;
    
    public AccountIdCookie(int accountId)
    {
        _accountId = accountId;
    }
    
    public static implicit operator HttpCookie(AccountIdCookie accountIdCookie)
    {
        return new HttpCookie(Name, accountIdCookie._accountId.ToString());
    }
}