Run a PowerShell Command as a different user not the script

I am building a GUI to get-GPResulantSetOfPolicy

I want to open the GUI as myself but run the following command as a User Account that is in the Domain Admins group.

Here is my cmd for getting the Domain Admin Credentials: This will prompt before launching the gui

$Cred=Get-Credential-Message'Enter your Credentials'

Here is my cmd for getting the GPO Report:

Get-GPResultantSetOfPolicy-Computer$textfield.Text -User$textfield1.Text -ReportTypeHTML-PathC:\GPOreport\RSOP.HTML

My problem is that the GUI is still running the Get-GPResulantSetOfPolicy under my credentials and I am getting Access Denied.

I know I can do the Start-Process Powershell.exe -Credential $Cred -NoNewWindow -Arguementlist "Start-Process powershell.exe -verb runAs"

But this opens a whole new Powershell window under the domain admin credentials and not my GUI Tool that I made.

So my question in short is how do I open my GUI as me, but run that Powershell CMD as the Domain Admin account?

Thanks,