"Easy-peasy" is a commonly used phrase that describes a task or activity that is very simple and effortless. However, there are many other synonyms to express the same meaning, such as "piece of cake," "a breeze," "child's play," "a cakewalk," "a snap," "effortless," "no-brainer," "simple as ABC," "a walk in the park," and "smooth sailing." These synonyms can be used interchangeably without losing the intended meaning. So, if you want to express that something is straightforward and simple, you can choose any of these words or phrases to convey the message.