“Too many” kinda sounds right to my ear because beans is plural, but the second logically seems right because its served by volume and is not ‘countable’ as ordinary (non-destroyed) beans might be.
“Too many” kinda sounds right to my ear because beans is plural, but the second logically seems right because its served by volume and is not ‘countable’ as ordinary (non-destroyed) beans might be.
“Scrambled eggs” is kind of similar. You could say, “I had too many scrambled eggs” or, “I had too much scrambled egg.”
So I think the correct version is:
“I had too much refried bean.”