Sugar on the Cream

Can be used in a sentence in place of “spilling the tea” such as heres the gossip. It can also be used to mean “heres the cherry on top”, such as heres the defining factor, or the important part.

Person 1: did you hear about so and so’s new marriage?
Person 2: No, but heres the Sugar on the Cream, she had an affair with her last husband!