name one instance where congress wasn't involved in decisions around war powers.

when were they involved in the past 30 years?

not once, but twice with iraq in 1990 and 2003 (just to name one). but you still haven't fielded my question.

For a similar situation to Trump bombing Iran and only notifying a few members of Congress:

1983 Granada 1989 Panama 2011 Libya 2012 Syria

The 1990s actions in Yugoslavia were done without fall declaration of war, but Congress was more fully engaged in saying no at least.

The 1991 war against Iraq was approved, in part, because the administration allowed a witness to flat out lie to Congress about the horrors of the Iraq invasion of Kuwait.

The 2003 invasion of Iraq was approved, in part, because the administration lied to Congress about weapons of mass destruction.

I mentioned these last two because they make a mockery of the act itself, or of the US congress, or both...