I followed the instruction at https://clojure.org/reference/deps_and_cli#quoting and the following command is working in Powershell.
clojure -Tclj-new create :template re-frame :name wara.spa :output front-end :args '[+garden """+10x""" +routes]'
Glad you got it working. Only about 5% of Clojure devs use PowerShell or CMD. About 5% use WSL2. The remaining 90% are on macOS or Linux. I use WSL2 so my experience is like that 90%.