Very simple example of creating a silent executable that runs a PowerShell script

New-PowerShellApp.ps1

function New-PowerShellApp {
    [CmdletBinding()]
    param([string]$FilePath, [string]$Script)
    end {
        $Script = $Script -replace '"', '""'

        Add-Type -OutputType WindowsApplication -OutputAssembly $FilePath -TypeDefinition @"
using System.Management.Automation;

namespace SilentPowerShell
{
    public static class Program
    {
        public static void Main()
        {
            using (var ps = PowerShell.Create())
            {
                ps.AddScript(@"$Script").Invoke();
            }
        }
    }
}
"@
    }
}