How do you professionally say “back the fuck up”

[BaeKart]

Professionally…

Instead of doing my own work my manager appears to be doing my work. But without any discussion with me or my team.

We execute plan A - everyone knows what they are doing. Manager goes off on a tangent and executes plan B (without any comms with anyone or a full appraisal of why we aren’t doing plan b).

So yeah. Back the fuck off. But nicely?

You do a factual review
we chose plan A as a collective group and we agreed aims , outcomes & tasks
you unilaterally imposed plan B without aims,plan,outcome and didn’t communicate it adequately

don’t personalise it
no getting drawn into politics
keep it task focussed

who is the team manager. You or them
who is responsible if plan B fails? You or them?

Either "Hi Jane I noticed that you got ingredients to make lemon drizzle cake when my understanding from the meeting last Tuesday was that we were going to be making a chicolate sponge. Please could you confirm if the cake plans have changed as I have already begin made preparations for the chocolate icing based on what was discussed. Please let me know asap as i will need to know my action points if we are going down the lemon sponge route"

OR. Go ahead with whatever your parts of plan A were, pretend you don't know manager is doing otherwise and let them deal with the fallout. I used to have to do this with my mabager to force her to remember she is part of a team and she needs to actually communicate her (frequent) changes of direction. I would deny all knowledge and refer back to the minutes of the emails where we were told to do whatever. This is a last resort though because it isnt professional.

Does your manager have a manager? I think you need to have a word. (With evidence)