Get-AWSEC2Instances.ps1

$Ec2Instances = @()

$Instances = (Get-EC2Instance -Filter `
    @(
        @{name = "tag:MyFirstTag"; values = "FirstTagValue" },
        @{name = "tag:MySecondTag"; values = @("SecondTagValue1"; "SecondTagValue2") }
    )
).Instances

foreach ($Instance in $Instances) {

    $Ec2Instance = [pscustomobject]@{
        Name        = ($Instance.Tag | Where-Object { $_.Key -eq 'MyFirstTag' }).Value
        Environment = ($Instance.Tag | Where-Object { $_.Key -eq 'MySecondTag' }).Value
    }

    $Ec2Instances += $Ec2Instance

    # Do per-instance operations
    $Instance
}