Create XML silently

I have a function I am using to create an XML file, but for some reason I am not able to figure out how to silently create it.  No matter what I have tried, I get the below echoed to the screen:

MemberType          : Method
OverloadDefinitions : {void Flush()}
TypeNameOfValue     : System.Management.Automation.PSMethod
Value               : void Flush()
Name                : Flush
IsInstance          : True

Outside of this, the script works fine.  After some testing, I found that it is the Flush that is causing this output.  Is the flush required?  I have seen scripts that don't have the flush but for the most part, the majority of the samples I have seen use flush

Here is my script

$filePath = "c:\users\blah\Profile-Update.xml"
    $givenName = "test"

    $encoding = [System.Text.Encoding]::UTF8
    $XmlWriter = New-Object System.XMl.XmlTextWriter($filePath,$encoding)

    $xmlWriter.Formatting = "Indented"
    $xmlWriter.WriteStartDocument()
     

    $xmlWriter.WriteStartElement("MappableItem")
     $XmlWriter.WriteStartElement("FIRSTNAME")
    $XmlWriter.WriteCdata($givenName)
    $xmlWriter.WriteEndElement()

    $xmlWriter.WriteEndElement() # <-- Closing RootElement
     
    $xmlWriter.WriteEndDocument()

    $xmlWriter.Finalize
    $xmlWriter.Flush 
    $xmlWriter.Close()