New-UserProfile.ps1

function New-UserProfile {
<#
.EXAMPLE
    New-UserProfile -DomainName MyLab -UserName MyUser -Verbose
#>
[cmdletbinding()]
[OutputType([System.IO.DirectoryInfo])]
param(
    [Parameter(Mandatory=$true)]
    [String]$UserName,

    [String]$DomainName = $env:USERDOMAIN
)
$PSDefaultParameterValues = @{'Get-CimInstance:Verbose' = $false}

try {
    Write-Verbose "Look up SID for user $UserName..."
    $objUser  = [Security.Principal.NTAccount]::new($DomainName, $UserName)
    $strSID   = $objUser.Translate([Security.Principal.SecurityIdentifier])
    $SID      = $strSID.Value
}
catch {Write-Warning "Could not find SID for $UserName" ; throw $_}

$code = @'
    using System;
    using System.Runtime.InteropServices;
    public static class PInvoke {
        [DllImport("userenv.dll", SetLastError = true, CharSet = CharSet.Auto)]
        public static extern int CreateProfile( [MarshalAs(UnmanagedType.LPWStr)] String pszUserSid, [MarshalAs(UnmanagedType.LPWStr)] String pszUserName, [Out, MarshalAs(UnmanagedType.LPWStr)] System.Text.StringBuilder pszProfilePath, uint cchProfilePath);
    }
'@
$sb  = [System.Text.StringBuilder]::new(260)
$len = $sb.Capacity

try   {Add-Type -TypeDefinition $code -ErrorAction Stop}
catch {Write-Warning 'Could not load pinvoke method' ; throw $_}

Write-Verbose "Create profile for user $UserName..."
try   {$result = [PInvoke]::CreateProfile($SID, $UserName, $sb, $len)}
catch {throw $_.Exception.Message}

switch($result) {
    '-2147024713'  {Write-Warning "Profile already exists for $userName" ; break}
    '-2147024809'  {Write-Warning "$username not found"                  ; break}
    '-2147023582'  {Write-Warning 'Please run this elevated'             ; return}
    0              {Write-Verbose "Profile created for user $UserName"   ; break}
    default        {Write-Warning 'Unknown result'                       ; break}
}

if ($result -eq 0 -or $result -eq '-2147024713') {
    Write-Verbose "Find the profile path for $UserName..."
    $Path = (Get-CimInstance  Win32_UserProfile | where SID -eq $SID).LocalPath

    if (Test-Path $Path) {Get-Item $Path}   # <-- this is the output, should be [System.IO.DirectoryInfo]
    else {throw "Could not find profile $Path"}
}

}