Automate Task Creation on a Schedule

Welcome to the Asana Community Forum @Caroline_Henry!

Here is a tool that might come handy.

Here is a feedback request thread you might wanna upvote: Clear data in recurring tasks

And here is some more info.

You also mentioned recurring every Monday at the same time which shouldn‘t be a problem.
Just in case you would require a different schedule here is another feedback request thread that might be interesting.