New Remote Task.ps1

function New-RemoteScheduledTask {
    [CmdletBinding()]
    param (  
    # Hostname to create the task on
    [string]
    $Hostname,
    
    # Credentials for connecting to the host
    [System.Management.Automation.PSCredential]
    $Credential,
    
    # Task Name
    [string]
    $Name,
    
    # Task Description (optional)
    [string]
    $Description,
    
    # Scheduled task action
    [CimInstance]
    $Action,
    
    # Scheduled task trigger
    [CimInstance]
    $Trigger,
    
    # Scheduled task principal
    [CimInstance]
    $Principal       
    )
    
    process {
        Invoke-Command -ComputerName $Hostname -Credential $Credential -ScriptBlock {
            Register-ScheduledTask -Action $Action -Trigger $Trigger -Principal $Principal -TaskName $Name -Description $Description
        }
    }
}

Sample usage:

$a = New-ScheduledTaskAction -Execute notepad
$at = (Get-Date).AddMinutes(2)
$t = New-ScheduledTaskTrigger -At $at -Once
$p = New-ScheduledTaskPrincipal -GroupId "BUILTIN\administrators" -RunLevel Highest
$c = Get-Credential
New-RemoteScheduledTask -Hostname foo -Credentials $c -Name "sample" -Description "" -Action $a -Trigger $t -Principal $p

It does not test the hostname and credentials before execution.